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2 definitions found
 for Polar coordinates
From The Collaborative International Dictionary of English v.0.48 :

  Polar \Po"lar\, a. [Cf. F. polaire. See Pole of the earth.]
     1. Of or pertaining to one of the poles of the earth, or of a
        sphere; situated near, or proceeding from, one of the
        poles; as, polar regions; polar seas; polar winds.
        [1913 Webster]
     2. Of or pertaining to the magnetic pole, or to the point to
        which the magnetic needle is directed.
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     3. (Geom.) Pertaining to, reckoned from, or having a common
        radiating point; as, polar coordinates.
        [1913 Webster]
     Polar axis, that axis of an astronomical instrument, as an
        equatorial, which is parallel to the earths axis.
     Polar+bear+(Zool.),+a+large+bear+({Ursus+maritimus">Polar bear (Zool.), a large bear ({Ursus maritimus syn.
        Thalarctos maritimus) inhabiting the arctic regions. It
        sometimes measures nearly nine feet in length and weighs
        1,600 pounds. It is partially amphibious, very powerful,
        and the most carnivorous of all the bears. The fur is
        white, tinged with yellow. Called also White bear. See
     Polar body, Polar cell, or Polar globule (Biol.), a
        minute cell which separates by karyokinesis from the ovum
        during its maturation. In the maturation of ordinary ova
        two polar bodies are formed, but in parthogenetic ova only
        one. The first polar body formed is usually larger than
        the second one, and often divides into two after its
        separation from the ovum. Each of the polar bodies removes
        maternal chromatin from the ovum to make room for the
        chromatin of the fertilizing spermatozoon; but their
        functions are not fully understood.
     Polar circles (Astron. & Geog.), two circles, each at a
        distance from a pole of the earth equal to the obliquity
        of the ecliptic, or about 23[deg] 28', the northern called
        the arctic circle, and the southern the antarctic circle.
     Polar clock, a tube, containing a polarizing apparatus,
        turning on an axis parallel to that of the earth, and
        indicating the hour of the day on an hour circle, by being
        turned toward the plane of maximum polarization of the
        light of the sky, which is always 90[deg] from the sun.
     Polar coordinates. See under 3d Coordinate.
     Polar dial, a dial whose plane is parallel to a great
        circle passing through the poles of the earth. --Math.
     Polar distance, the angular distance of any point on a
        sphere from one of its poles, particularly of a heavenly
        body from the north pole of the heavens.
     Polar equation of a line or Polar equation of a surface,
        an equation which expresses the relation between the polar
        coordinates of every point of the line or surface.
     Polar forces (Physics), forces that are developed and act
        in pairs, with opposite tendencies or properties in the
        two elements, as magnetism, electricity, etc.
     Polar hare (Zool.), a large hare of Arctic America ({Lepus
        arcticus), which turns pure white in winter. It is
        probably a variety of the common European hare ({Lepus
     Polar lights, the aurora borealis or australis.
     Polar opposition, or Polaric opposition or Polar
     contrast or Polaric contrast (Logic), an opposition or
        contrast made by the existence of two opposite conceptions
        which are the extremes in a species, as white and black in
        colors; hence, as great an opposition or contrast as
     Polar projection. See under Projection.
     Polar spherical triangle (Spherics), a spherical triangle
        whose three angular points are poles of the sides of a
        given triangle. See 4th Pole, 2.
     Polar whale (Zool.), the right whale, or bowhead. See
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Coordinate \Co*["o]r"di*nate\, n.
     1. A thing of the same rank with another thing; one two or
        more persons or things of equal rank, authority, or
        [1913 Webster]
              It has neither coordinate nor analogon; it is
              absolutely one.                       --Coleridge.
        [1913 Webster]
     2. pl. (Math.) Lines, or other elements of reference, by
        means of which the position of any point, as of a curve,
        is defined with respect to certain fixed lines, or planes,
        called coordinate axes and coordinate planes. See
     Note: Coordinates are of several kinds, consisting in some of
           the different cases, of the following elements, namely:
        (a) (Geom. of Two Dimensions) The abscissa and ordinate of
            any point, taken together; as the abscissa PY and
            ordinate PX of the point P (Fig. 2, referred to the
            coordinate axes AY and AX.
        (b) Any radius vector PA (Fig. 1), together with its angle
            of inclination to a fixed line, APX, by which any
            point A in the same plane is referred to that fixed
            line, and a fixed point in it, called the pole, P.
        (c) (Geom. of Three Dimensions) Any three lines, or
            distances, PB, PC, PD (Fig. 3), taken parallel to
            three coordinate axes, AX, AY, AZ, and measured from
            the corresponding coordinate fixed planes, YAZ, XAZ,
            XAY, to any point in space, P, whose position is
            thereby determined with respect to these planes and
        (d) A radius vector, the angle which it makes with a fixed
            plane, and the angle which its projection on the plane
            makes with a fixed line line in the plane, by which
            means any point in space at the free extremity of the
            radius vector is referred to that fixed plane and
            fixed line, and a fixed point in that line, the pole
            of the radius vector.
            [1913 Webster]
     Cartesian coordinates. See under Cartesian.
     Geographical coordinates, the latitude and longitude of a
        place, by which its relative situation on the globe is
        known. The height of the above the sea level constitutes a
        third coordinate.
     Polar coordinates, coordinates made up of a radius vector
        and its angle of inclination to another line, or a line
        and plane; as those defined in
        (b) and
        (d) above.
     Rectangular coordinates, coordinates the axes of which
        intersect at right angles.
     Rectilinear coordinates, coordinates made up of right
        lines. Those defined in
        (a) and
        (c) above are called also Cartesian coordinates.
     Trigonometrical coordinates or Spherical coordinates,
        elements of reference, by means of which the position of a
        point on the surface of a sphere may be determined with
        respect to two great circles of the sphere.
     Trilinear coordinates, coordinates of a point in a plane,
        consisting of the three ratios which the three distances
        of the point from three fixed lines have one to another.
        [1913 Webster]

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