Isinglass

//ˈaɪzɪŋɡlɑːs// noun

Definitions

Noun
  1. 1
    A form of gelatine obtained from the air bladder of the sturgeon and certain other fish, used as an adhesive and as a clarifying agent for wine and beer. uncountable, usually

    "Isinglass flummery.—Put six ounces of isinglass into a quart of new milk, sweeten it, set it over the fire, and keep it stirring one way all the time, till it is jellied; pour it into basins, and when cold turn it out; you may put in orange flower water if you like."

  2. 2
    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 wordnet
  3. 3
    A thin, transparent sheet of mica (probably from its similarity to true isinglass and/or resulting from confusion with the term Muscovy glass for glazing made from mica, but also used for isinglass, which was chiefly produced in the Caspian Sea region of Russia, or Muscovy). uncountable, usually

    "TALC. / GENUS I. / ISINGLASS. / VITRUM. / Compoſed of broad, flat, cloſe, poliſhed Plates."

Etymology

Apparently from obsolete Dutch huisenblas, from German Hausenblase, from Hausen (“sturgeon of the Huso genus”) + Blase (“bladder”), with alteration after glass.

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