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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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Definitions of isinglass

isinglass (n.)
any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity;
Synonyms: mica
From wordnet.princeton.edu