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[ahy-zuh n-glas, -glahs, ahy-zing-] /ˈaɪ zənˌglæs, -ˌglɑs, ˈaɪ zɪŋ-/
a pure, transparent or translucent form of gelatin, obtained from the air bladders of certain fish, especially the sturgeon: used in glue and jellies and as a clarifying agent.
mica, especially in thin, translucent sheets.
Origin of isinglass
1535-45; < Middle Dutch huysenblase (with glass for blase by folk etymology), literally, sturgeon bladder; cognate with German Hausenblase Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for isinglass


a gelatine made from the air bladders of freshwater fish, used as a clarifying agent and adhesive
Word Origin
C16: from Middle Dutch huysenblase, literally: sturgeon bladder; influenced by English glass
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for isinglass

1520s, said to be perversion of Dutch huysenblas, literally "sturgeon bladder," from huysen "sturgeon" + blas "bladder;" so called because the substance was obtained from it.

Online Etymology Dictionary, © 2010 Douglas Harper
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isinglass in Science
  (ī'zən-glās', ī'zĭng-)   
  1. A transparent, almost pure gelatin prepared from the inner membrane of the swim bladder of the sturgeon and certain other fishes. It is used as an adhesive and a clarifying agent.

  2. Mica, especially in the form of the mineral muscovite.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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