gypseous

gypseous

[jip-see-uhs]
adjective
of or pertaining to gypsum.

Origin:
1655–65; < Late Latin gypseus. See gypsum, -eous

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gypsum (ˈdʒɪpsəm)
 
n
a colourless or white mineral sometimes tinted by impurities, found in beds as an evaporite. It is used in the manufacture of plaster of Paris, cement, paint, school chalk, glass, and fertilizer. Composition: hydrated calcium sulphate. Formula: CaSO4.2H2O. Crystal structure: monoclinic
 
[C17: from Latin, from Greek gupsos chalk, plaster, cement, of Semitic origin]
 
gypseous
 
adj
 
gypsiferous
 
adj

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