Gyp"sum (j&ibreve;p"sŭm), n. [L. gypsum, Gr. gy`psos; 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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