isinglass

isin·glass

noun \ˈīz-^ən-ˌglas, ˈī-ziŋ-\

Definition of ISINGLASS

1

: a semitransparent whitish very pure gelatin prepared from the air bladders of fishes (as sturgeons) and used especially as a clarifying agent and in jellies and glue—called also ichthyocolla

2

: mica