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1520s, said to be perversion of Dutch huysenblas, literally "sturgeon bladder," from huysen "sturgeon" + blas "bladder;" so called because the substance was obtained from it.
A transparent, almost pure gelatin prepared from the inner membrane of the swim bladder of the sturgeon and certain other fishes. It is used as an adhesive and a clarifying agent.
Mica, especially in the form of the mineral muscovite.