gypsum

Etymology

From Latin gypsum, from Ancient Greek γύψος (gúpsos). Doublet of gesso.

noun

  1. A mineral consisting of hydrated calcium sulphate. When calcinated, it forms plaster of Paris.
    Besides being abundant, gypsum is easily refined into a powder for plaster or formed into sheets of wallboard. 1980, Robert M. Jones, editor, Walls and Ceilings, Time-Life Books, page 7

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