Etymology
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gypsum (n.)

substance (hydrated calcium sulphate) used in making plaster, late 14c., from Latin gypsum, from Greek gypsos "chalk," according to Klein, a word perhaps of Semitic origin (compare Arabic jibs, Hebrew gephes "plaster").

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Definitions of gypsum

gypsum (n.)
a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris);
From wordnet.princeton.edu