ISINGLASSES

Noun

isinglasses

plural of isinglass

Source: Wiktionary

ISINGLASS

I"sin*glass, n. Etym: [Prob. corrupted fr. D. huizenblas (akin to G. hausenblase), lit., bladder of the huso, or large sturgeon; huizen sturgeon + blas bladder. Cf. Bladder, Blast a gust of wind.]

1. 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.

2. (Min.)

Definition: A popular name for mica, especially when in thin sheets.

Source: Webster’s Unabridged Dictionary 1913 Edition