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5 definitions found
 for H2O
From The Collaborative International Dictionary of English v.0.48 :

  H2O \H2O\ n. ([=a]ch`t[=oo]`[=o]"),
     The chemical formula for water.
     Syn: water, hydrogen oxide.
          [WordNet 1.5]

From The Collaborative International Dictionary of English v.0.48 :

  Molecular \Mo*lec"u*lar\, a. [Cf. F. mol['e]culare. See
     Molecule.] (Phys. & Chem.)
     Pertaining to, connected with, produced by, or consisting of,
     molecules; as, molecular forces; molecular groups of atoms,
     [1913 Webster]
     Molecular attraction (Phys.), attraction acting between the
        molecules of bodies, and at insensible distances.
     Molecular weight (Chem.), the weight of a molecule of any
        gas or vapor as compared with the hydrogen atom having
        weight of 1 as a standard; the sum of the atomic weights
        of the constituents of a molecule; thus, the molecular
        weight of water ({H2O) is 18. For more precise
        measurements, the weight of the carbon isotope carbon-12
        is used as the standard, that isotope having the value of
        12.000. In this systen, now used almost universally, the
        hydrogen atom has a weight of 1.0079.
        [1913 Webster +PJC]

From The Collaborative International Dictionary of English v.0.48 :

  Type \Type\ (t[imac]p), n. [F. type; cf. It. tipo, from L. typus
     a figure, image, a form, type, character, Gr. ty`pos the mark
     of a blow, impression, form of character, model, from the
     root of ty`ptein to beat, strike; cf. Skr. tup to hurt.]
     1. The mark or impression of something; stamp; impressed
        sign; emblem.
        [1913 Webster]
              The faith they have in tennis, and tall stockings,
              Short blistered breeches, and those types of travel.
        [1913 Webster]
     2. Form or character impressed; style; semblance.
        [1913 Webster]
              Thy father bears the type of king of Naples. --Shak.
        [1913 Webster]
     3. A figure or representation of something to come; a token;
        a sign; a symbol; -- correlative to antitype.
        [1913 Webster]
              A type is no longer a type when the thing typified
              comes to be actually exhibited.       --South.
        [1913 Webster]
     4. That which possesses or exemplifies characteristic
        qualities; the representative. Specifically:
        (a) (Biol.) A general form or structure common to a number
            of individuals; hence, the ideal representation of a
            species, genus, or other group, combining the
            essential characteristics; an animal or plant
            possessing or exemplifying the essential
            characteristics of a species, genus, or other group.
            Also, a group or division of animals having a certain
            typical or characteristic structure of body maintained
            within the group.
            [1913 Webster]
                  Since the time of Cuvier and Baer . . . the
                  whole animal kingdom has been universally held
                  to be divisible into a small number of main
                  divisions or types.               --Haeckel.
            [1913 Webster]
        (b) (Fine Arts) The original object, or class of objects,
            scene, face, or conception, which becomes the subject
            of a copy; esp., the design on the face of a medal or
            a coin.
            [1913 Webster]
        (c) (Chem.) A simple compound, used as a model or pattern
            to which other compounds are conveniently regarded as
            being related, and from which they may be actually or
            theoretically derived.
            [1913 Webster]
     Note: The fundamental types used to express the simplest and
           most essential chemical relations are hydrochloric
           acid, HCl; water, H2O; ammonia, NH3; and methane,
           [1913 Webster]
     5. (Typog.)
        (a) A raised letter, figure, accent, or other character,
            cast in metal or cut in wood, used in printing.
        (b) Such letters or characters, in general, or the whole
            quantity of them used in printing, spoken of
            collectively; any number or mass of such letters or
            characters, however disposed.
            [1913 Webster]
     Note: Type are mostly made by casting type metal in a mold,
           though some of the larger sizes are made from maple,
           mahogany, or boxwood. In the cut, a is the body; b, the
           face, or part from which the impression is taken; c,
           the shoulder, or top of the body; d, the nick
           (sometimes two or more are made), designed to assist
           the compositor in distinguishing the bottom of the face
           from t`e top; e, the groove made in the process of
           finishing, -- each type as cast having attached to the
           bottom of the body a jet, or small piece of metal
           (formed by the surplus metal poured into the mold),
           which, when broken off, leaves a roughness that
           requires to be removed. The fine lines at the top and
           bottom of a letter are technically called ceriphs, and
           when part of the face projects over the body, as in the
           letter f, the projection is called a kern.
           [1913 Webster] The type which compose an ordinary book
           font consist of Roman CAPITALS, small capitals, and
           lower-case letters, and Italic CAPITALS and lower-case
           letters, with accompanying figures, points, and
           reference marks, -- in all about two hundred
           characters. Including the various modern styles of
           fancy type, some three or four hundred varieties of
           face are made. Besides the ordinary Roman and Italic,
           some of the most important of the varieties are 
           [1913 Webster] Old English. Black Letter. Old Style.
           French Elzevir. Boldface. Antique. Clarendon. Gothic.
           Typewriter. Script.
           [1913 Webster] The smallest body in common use is
           diamond; then follow in order of size, pearl, agate,
           nonpareil, minion, brevier, bourgeois (or two-line
           diamond), long primer (or two-line pearl), small pica
           (or two-line agate), pica (or two-line nonpareil),
           English (or two-line minion), Columbian (or two-line
           brevier), great primer (or two-line bourgeois), paragon
           (or two-line long primer), double small pica (or
           two-line small pica), double pica (or two-line pica),
           double English (or two-line English), double great
           primer (or two-line great primer), double paragon (or
           two-line paragon), canon (or two-line double pica).
           Above this, the sizes are called five-line pica,
           six-line pica, seven-line pica, and so on, being made
           mostly of wood. The following alphabets show the
           different sizes up to great primer.
           [1913 Webster] Brilliant . . abcdefghijklmnopqrstuvwxyz
           Diamond . . abcdefghijklmnopqrstuvwxyz Pearl . . .
           abcdefghijklmnopqrstuvwxyz Agate . . .
           abcdefghijklmnopqrstuvwxyz Nonpareil . . .
           abcdefghijklmnopqrstuvwxyz Minion . . .
           abcdefghijklmnopqrstuvwxyz Brevier . . .
           abcdefghijklmnopqrstuvwxyz Bourgeois . .
           abcdefghijklmnopqrstuvwxyz Long primer . . .
           abcdefghijklmnopqrstuvwxyz Small pica . .
           abcdefghijklmnopqrstuvwxyz Pica . . . . .
           abcdefghijklmnopqrstuvwxyz English . . .
           abcdefghijklmnopqrstuvwxyz Columbian . . .
           abcdefghijklmnopqrstuvwxyz Great primer . . .
           [1913 Webster] The foregoing account is conformed to
           the designations made use of by American type founders,
           but is substantially correct for England. Agate,
           however, is called ruby, in England, where, also, a
           size intermediate between nonpareil and minion is
           employed, called emerald.
           [1913 Webster]
     Point system of type bodies (Type Founding), a system
        adopted by the type founders of the United States by which
        the various sizes of type have been so modified and
        changed that each size bears an exact proportional
        relation to every other size. The system is a modification
        of a French system, and is based on the pica body. This
        pica body is divided into twelfths, which are termed
        "points," and every type body consist of a given number of
        these points. Many of the type founders indicate the new
        sizes of type by the number of points, and the old names
        are gradually being done away with. By the point system
        type founders cast type of a uniform size and height,
        whereas formerly fonts of pica or other type made by
        different founders would often vary slightly so that they
        could not be used together. There are no type in actual
        use corresponding to the smaller theoretical sizes of the
        point system. In some cases, as in that of ruby, the term
        used designates a different size from that heretofore so
        [1913 Webster] 1 American 9 Bourgeois [bar] [bar] 11/2
        German [bar] 2 Saxon 10 Long Primer [bar] [bar] 21/2 Norse
        [bar] 3 Brilliant 11 Small Pica [bar] [bar] 31/2 Ruby 12
        Pica [bar] [bar] 4 Excelsior [bar] 41/2 Diamond 14 English
        [bar] [bar] 5 Pearl 16 Columbian [bar] [bar] 51/2 Agate
        [bar] 6 Nonpareil 18 Great Primer [bar] [bar] 7 Minion
        [bar] 8 Brevier 20 Paragon [bar] [bar] Diagram of the
        "points" by which sizes of Type are graduated in the
        "Point System".
        [1913 Webster]
     Type founder, one who casts or manufacture type.
     Type foundry, Type foundery, a place for the manufacture
        of type.
     Type metal, an alloy used in making type, stereotype
        plates, etc., and in backing up electrotype plates. It
        consists essentially of lead and antimony, often with a
        little tin, nickel, or copper.
     Type wheel, a wheel having raised letters or characters on
        its periphery, and used in typewriters, printing
        telegraphs, etc.
     Unity of type (Biol.), that fundamental agreement in
        structure which is seen in organic beings of the same
        class, and is quite independent of their habits of life.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Water \Wa"ter\ (w[add]"t[~e]r), n. [AS. w[ae]ter; akin to OS.
     watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG.
     wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O.
     Slav. & Russ. voda, Gr. 'y`dwr, Skr. udan water, ud to wet,
     and perhaps to L. unda wave. [root]137. Cf. Dropsy,
     Hydra, Otter, Wet, Whisky.]
     1. The fluid which descends from the clouds in rain, and
        which forms rivers, lakes, seas, etc. "We will drink
        water." --Shak. "Powers of fire, air, water, and earth."
        [1913 Webster]
     Note: Pure water consists of hydrogen and oxygen, H2O, and
           is a colorless, odorless, tasteless, transparent
           liquid, which is very slightly compressible. At its
           maximum density, 39[deg] Fahr. or 4[deg] C., it is the
           standard for specific gravities, one cubic centimeter
           weighing one gram. It freezes at 32[deg] Fahr. or
           0[deg] C. and boils at 212[deg] Fahr. or 100[deg] C.
           (see Ice, Steam). It is the most important natural
           solvent, and is frequently impregnated with foreign
           matter which is mostly removed by distillation; hence,
           rain water is nearly pure. It is an important
           ingredient in the tissue of animals and plants, the
           human body containing about two thirds its weight of
           [1913 Webster]
     2. A body of water, standing or flowing; a lake, river, or
        other collection of water.
        [1913 Webster]
              Remembering he had passed over a small water a poor
              scholar when first coming to the university, he
              kneeled.                              --Fuller.
        [1913 Webster]
     3. Any liquid secretion, humor, or the like, resembling
        water; esp., the urine.
        [1913 Webster]
     4. (Pharm.) A solution in water of a gaseous or readily
        volatile substance; as, ammonia water. --U. S. Pharm.
        [1913 Webster]
     5. The limpidity and luster of a precious stone, especially a
        diamond; as, a diamond of the first water, that is,
        perfectly pure and transparent. Hence, of the first water,
        that is, of the first excellence.
        [1913 Webster]
     6. A wavy, lustrous pattern or decoration such as is imparted
        to linen, silk, metals, etc. See Water, v. t., 3,
        Damask, v. t., and Damaskeen.
        [1913 Webster]
     7. An addition to the shares representing the capital of a
        stock company so that the aggregate par value of the
        shares is increased while their value for investment is
        diminished, or "diluted." [Brokers' Cant]
        [1913 Webster]
     Note: Water is often used adjectively and in the formation of
           many self-explaining compounds; as, water drainage;
           water gauge, or water-gauge; waterfowl, water-fowl, or
           water fowl; water-beaten; water-borne, water-circled,
           water-girdled, water-rocked, etc.
           [1913 Webster]
     Hard water. See under Hard.
     Inch of water, a unit of measure of quantity of water,
        being the quantity which will flow through an orifice one
        inch square, or a circular orifice one inch in diameter,
        in a vertical surface, under a stated constant head; also
        called miner's inch, and water inch. The shape of the
        orifice and the head vary in different localities. In the
        Western United States, for hydraulic mining, the standard
        aperture is square and the head from 4 to 9 inches above
        its center. In Europe, for experimental hydraulics, the
        orifice is usually round and the head from 1/2 of an inch
        to 1 inch above its top.
     Mineral water, waters which are so impregnated with foreign
        ingredients, such as gaseous, sulphureous, and saline
        substances, as to give them medicinal properties, or a
        particular flavor or temperature.
     Soft water, water not impregnated with lime or mineral
     To hold water. See under Hold, v. t.
     To keep one's head above water, to keep afloat; fig., to
        avoid failure or sinking in the struggles of life.
     To make water.
        (a) To pass urine. --Swift.
        (b) (Naut.) To admit water; to leak.
     Water of crystallization (Chem.), the water combined with
        many salts in their crystalline form. This water is
        loosely, but, nevertheless, chemically, combined, for it
        is held in fixed and definite amount for each substance
        containing it. Thus, while pure copper sulphate, CuSO4,
        is a white amorphous substance, blue vitriol, the
        crystallized form, CuSO4.5H2O, contains five molecules
        of water of crystallization.
     Water on the brain (Med.), hydrocephalus.
     Water on the chest (Med.), hydrothorax.
        [1913 Webster]
     Note: Other phrases, in which water occurs as the first
           element, will be found in alphabetical order in the
           [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: binary compound that occurs at room temperature as a clear
           colorless odorless tasteless liquid; freezes into ice below
           0 degrees centigrade and boils above 100 degrees
           centigrade; widely used as a solvent [syn: water, H2O]

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