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isinglass

[ahy-zuh n-glas, -glahs, ahy-zing-]
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noun
  1. 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.
  2. mica, especially in thin, translucent sheets.
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Origin of isinglass

1535–45; < Middle Dutch huysenblase (with glass for blase by folk etymology), literally, sturgeon bladder; cognate with German Hausenblase
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for isinglass

isinglass

noun
  1. a gelatine made from the air bladders of freshwater fish, used as a clarifying agent and adhesive
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for isinglass

n.

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

isinglass in Science

isinglass

zən-glăs′, īzĭng-]
  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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.