The Collaborative International Dictionary
Isinglass \I"sin*glass\, n. [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.]
A semitransparent, whitish, and very pure form of gelatin, chiefly prepared from the sounds or air bladders of various species of sturgeons (as the Acipenser huso) found in the rivers 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.
(Min.) A popular name for mica, especially when in thin sheets.
Wiktionary
n. isinglass
WordNet
n. gelatinous substance obtained by boiling skins fins and bones of fish
Usage examples of "fish glue".
One had to asphyxiate a caul fly if one wanted to remove it whole: block its airhole with a bead of fish glue, fasten a cap of bladderskin over the boil, then seal the cap edges with more glue.
For one thing, we show these people how to build pool tables and how to make a hair-setting spray from fish glue, deodorized.
They smeared their upper lips and chins with a dark liquid made from finely ground charcoal, fish glue, oak tannin, and several other ingredients.
I don't know about chicken hearts, but some brewers use seaweed extract as a foam stabilizer, and some wine makers use fish glue to prevent cloudiness.
The gathered ghost stretched thin in spots, held together as if by fish glue, while other parts were clumps of eyes and hands and mouths.
I did invent attttle fish glue to reinforce the twine that I tied them with, though I actually did manage to get the feather ends into the cavities of the old ones.
A trio of men skilled at fletching sat with their pots of evil-smelling fish glue and sacks of feathers and sharp little knives, haggling the charge with fellow archers even while their skilled fingers scurried about their tasks.