Hypertext Webster Gateway: "gypsum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Gypsum \Gyp"sum\, n. [L. gypsum, Gr. ?; cf. Ar. jibs plaster,
mortar, Per. jabs?n lime.] (Min.)
A mineral consisting of the hydrous sulphate of lime
(calcium). When calcined, it forms plaster of Paris. Selenite
is a transparent, crystalline variety; alabaster, a fine,
white, massive variety.
From WordNet (r) 1.7 (wn)
gypsum
n : a common white or colorless mineral (hydrated calcium
sulphate) used to make cements and plasters (especially
plaster of Paris)
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