Definition of gypsum
English to English noun - a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
source: WordNet 3.0 - A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, stype forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.
source: Webster 1913
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