isinglass
noun
isin·glass
ˈī-zᵊn-ˌglas
ˈī-ziŋ-
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 sense 2
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Merriam-Webster unabridged
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