[ 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 Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for isinglass

British Dictionary definitions for isinglass

/ (ˈaɪzɪŋˌɡlɑːs) /


a gelatine made from the air bladders of freshwater fish, used as a clarifying agent and adhesive

Word Origin for isinglass

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

Scientific definitions for isinglass

[ īzən-glăs′, īzĭng- ]

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.
Mica, especially in the form of the mineral muscovite.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.