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

  Isinglass \I"sin*glass\, n. [Prob. corrupted fr. D. huizenblas
     (akin to G. hausenblase), lit., bladder of the huso, or large
     sturgeon; huizen sturgeon + blas bladder. Cf. Bladder,
     Blast a gust of wind.]
     [1913 Webster]
     1. A semitransparent, whitish, and very pure form of gelatin,
        chiefly prepared from the sounds or air bladders of
        various species of sturgeons (as the Acipenser huso)
        found in the rivers of Western Russia. It used for making
        jellies, as a clarifier, etc. Cheaper forms of gelatin are
        not unfrequently so called. Called also fish glue.
        [1913 Webster]
  
     2. (Min.) A popular name for mica, especially when in thin
        sheets.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Mica \Mi"ca\, n. [L. mica crumb, grain, particle; cf. F. mica.]
     (Min.)
     The name of a group of minerals characterized by highly
     perfect cleavage, so that they readily separate into very
     thin leaves, more or less elastic. They differ widely in
     composition, and vary in color from pale brown or yellow to
     green or black. The transparent forms are used in lanterns,
     the doors of stoves, etc., being popularly called
     isinglass. Formerly called also cat-silver, and
     glimmer.
     [1913 Webster]
  
     Note: The important species of the mica group are:
           muscovite, common or potash mica, pale brown or
           green, often silvery, including damourite (also
           called hydromica and muscovy glass); biotite,
           iron-magnesia mica, dark brown, green, or black;
           lepidomelane, iron, mica, black; phlogopite,
           magnesia mica, colorless, yellow, brown; lepidolite,
           lithia mica, rose-red, lilac.
           [1913 Webster] Mica (usually muscovite, also biotite)
           is an essential constituent of granite, gneiss, and
           mica slate; biotite is common in many eruptive rocks;
           phlogopite in crystalline limestone and serpentine.
           [1913 Webster]
  
     Mica diorite (Min.), an eruptive rock allied to diorite but
        containing mica (biotite) instead of hornblende.
  
     Mica powder, a kind of dynamite containing fine scales of
        mica.
  
     Mica schist, Mica slate (Geol.), a schistose rock,
        consisting of mica and quartz with, usually, some
        feldspar.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  isinglass
      n 1: any of various minerals consisting of hydrous silicates of
           aluminum or potassium etc. that crystallize in forms that
           allow perfect cleavage into very thin leaves; used as
           dielectrics because of their resistance to electricity
           [syn: mica, isinglass]

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