Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A widespread colorless, white, or yellowish mineral, CaSO4·2H2O, used in the manufacture of plaster of Paris, various plaster products, and fertilizers.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A mineral consisting of the hydrated calcium sulphate. When calcined, it forms plaster of Paris.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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 The Century Dictionary and Cyclopedia

  • n. Native hydrous sulphate of calcium, a mineral usually of a white color, but also gray, yellow, red, and when impure brown or black.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)

Etymologies

Middle English gipsum, from Latin gypsum, from Greek gupsos, probably of Semitic origin; akin to Arabic jibs, jiṣṣ, jaṣṣ, from Akkadian gaṣṣu.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin gypsum, from Ancient Greek γύψος. (Wiktionary)

Examples

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