isinglass

/ˈaɪzɪŋˌɡlæs/
noun
  1. A clear, jelly-like substance made from fish bladders, used to make beer and wine clear, or as a glue.
    • Isinglass was once a common ingredient in bookbinding glue.
    • Brewers sometimes add isinglass to beer to remove cloudiness.
    • The old recipe called for isinglass to clarify the wine.
  2. A thin, transparent sheet of mica used as a window or in stoves.
    • The antique clock had a face made of isinglass.
    • They used isinglass in the lantern to protect the flame from wind.
    • The wood stove had a small door with a pane of isinglass.
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