Part of speech: noun

Sulfate of lime: when calcined, called plaster of Paris.

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Usage examples "gypsum":

  1. Sulphate of lime: Gypsum or plaster of Paris. - "The American Woman's Home", Catherine E. Beecher and Harriet Beecher Stowe.
  2. When I apply the latter term, on the other hand, I mean to express the opinion that the forms A, B, and C constitute a line of descent, and that B is thus part of the lineage of C. From the time when Cuvier's wonderful researches upon the extinct Mammals of the Paris gypsum first made intercalary types known, and caused them to be recognized as such, the number of such forms has steadily increased among the higher Mammalia. - "Critiques and Addresses", Thomas Henry Huxley.
  3. Its great enemies are the plow, gypsum, and the horse- rake. - "Locusts and Wild Honey", John Burroughs.