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Definition of: gypsum
(jip′səm) noun
Hydrous sulfate of lime, CaSO4·2H2O, occurring in massive, fibrous, foliated, or granular form. The crystalline and usually transparent form is called selenite; the massive fine-grained, white or delicately colored variety is called alabaster; when calcined, it is called plaster of Paris. [<L <Gk. gypsos chalk]
—gyp′se·ous adjective
—gyp·sif·er·ous (jip·sif′ər·əs) adjective
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