Etymology
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isinglass (n.)
purest commercial form of gelatin, 1520s, apparently a perversion of Dutch huysenblas, literally "sturgeon bladder," from huysen "sturgeon" + blas "bladder," from Proto-Germanic *bles-, extended form of PIE root *bhle- "to blow." So called because the substance was obtained from the air-bladders of certain freshwater fishes.
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*bhle- 
bhlē-, Proto-Indo-European root meaning "to blow," possibly a variant of PIE root *bhel- (2) "to blow, swell."

It forms all or part of: afflatus; bladder; blase; blast; blather; blaze (v.2) "make public;" blow (v.1) "move air;" conflate; deflate; flageolet; flatulent; flatus; flavor; inflate; inflation; insufflation; isinglass; souffle.
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