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.

updated on May 05, 2017

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Definitions of isinglass from WordNet

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
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.