(n.) A semitransparent, whitish, and very pure from of gelatin, chiefly prepared from the sounds or air bladders of various species of sturgeons (as the Acipenser huso) found in the of Western Russia. It used for making jellies, as a clarifier, etc. Cheaper forms of gelatin are not unfrequently so called. Called also fish glue.
ISINGLASS
Meaning of ISINGLASS in English
Webster's English dictionary. Английский словарь Webster. 2012