[ahy-zuhn-glas, -glahs, ahy-zing-]
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.

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. 2014.
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World English Dictionary
isinglass (ˈaɪzɪŋˌɡlɑːs)
a gelatine made from the air bladders of freshwater fish, used as a clarifying agent and adhesive
[C16: from Middle Dutch huysenblase, literally: sturgeon bladder; influenced by English glass]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1528, said to be perversion of Du. huysenblas, lit. "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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American Heritage
Science Dictionary
isinglass   (ī'zən-glās', ī'zĭng-)  Pronunciation Key 
  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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