Definition of isinglass
1 : a semitransparent whitish very pure gelatin prepared from the air bladders of fishes (such as sturgeons) and used especially as a clarifying agent and in jellies and glue
2 : mica especially when in thin transparent sheets; especially : muscovite 2
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Origin and Etymology of isinglass
probably by folk etymology from obsolete Dutch huizenblas, from Middle Dutch huusblase, from huus sturgeon + blase bladder
First Known Use: 1535
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