Gyp″sum (jĭp″sŭm), n. [L. gypsum, Gr. γύψοσ; cf. Ar. jibs plaster, mortar, Per. jabsīn lime.] (Min.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.