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3 definitions found
 for porcelain clay
From The Collaborative International Dictionary of English v.0.48 :

  Porcelain \Por"ce*lain\ (277), n. [F. porcelaine, It.
     porcellana, orig., the porcelain shell, or Venus shell
     (Cypr[ae]a porcellana), from a dim. fr. L. porcus pig,
     probably from the resemblance of the shell in shape to a
     pig's back. Porcelain was called after this shell, either on
     account of its smoothness and whiteness, or because it was
     believed to be made from it. See Pork.]
     A fine translucent or semitransculent kind of earthenware,
     made first in China and Japan, but now also in Europe and
     America; -- called also China, or China ware.
     [1913 Webster]
           Porcelain, by being pure, is apt to break. --Dryden.
     [1913 Webster]
     Ivory porcelain, porcelain with a surface like ivory,
        produced by depolishing. See Depolishing.
     Porcelain clay. See under Clay.
     Porcelain crab (Zool.), any crab of the genus Porcellana
        and allied genera (family Porcellanid[ae]). They have a
        smooth, polished carapace.
     Porcelain jasper. (Min.) See Porcelanite.
     Porcelain printing, the transferring of an impression of an
        engraving to porcelain.
     Porcelain shell (Zool.), a cowry.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Clay \Clay\ (kl[=a]), n. [AS. cl[=ae]g; akin to LG. klei, D.
     klei, and perh. to AS. cl[=a]m clay, L. glus, gluten glue,
     Gr. gloio`s glutinous substance, E. glue. Cf. Clog.]
     1. A soft earth, which is plastic, or may be molded with the
        hands, consisting of hydrous silicate of aluminium. It is
        the result of the wearing down and decomposition, in part,
        of rocks containing aluminous minerals, as granite. Lime,
        magnesia, oxide of iron, and other ingredients, are often
        present as impurities.
        [1913 Webster]
     2. (Poetry & Script.) Earth in general, as representing the
        elementary particles of the human body; hence, the human
        body as formed from such particles.
        [1913 Webster]
              I also am formed out of the clay.     --Job xxxiii.
        [1913 Webster]
              The earth is covered thick with other clay,
              Which her own clay shall cover.       --Byron.
        [1913 Webster]
     Bowlder clay. See under Bowlder.
     Brick clay, the common clay, containing some iron, and
        therefore turning red when burned.
     Clay cold, cold as clay or earth; lifeless; inanimate.
     Clay ironstone, an ore of iron consisting of the oxide or
        carbonate of iron mixed with clay or sand.
     Clay marl, a whitish, smooth, chalky clay.
     Clay mill, a mill for mixing and tempering clay; a pug
     Clay pit, a pit where clay is dug.
     Clay slate (Min.), argillaceous schist; argillite.
     Fatty clays, clays having a greasy feel; they are chemical
        compounds of water, silica, and aluminia, as halloysite,
        bole, etc.
     Fire clay, a variety of clay, entirely free from lime,
        iron, or an alkali, and therefore infusible, and used for
        fire brick.
     Porcelain clay, a very pure variety, formed directly from
        the decomposition of feldspar, and often called kaolin.
     Potter's clay, a tolerably pure kind, free from iron.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  porcelain clay
      n 1: a fine usually white clay formed by the weathering of
           aluminous minerals (as feldspar); used in ceramics and as
           an absorbent and as a filler (e.g., in paper) [syn: china
           clay, china stone, kaolin, kaoline, porcelain
           clay, terra alba]

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