gyp-sum

gypsum

[jip-suhm]
noun
a very common mineral, hydrated calcium sulfate, CaSO 4 ⋅2H 2 O, occurring in crystals and in masses, soft enough to be scratched by the fingernail: used to make plaster of Paris, as an ornamental material, as a fertilizer, etc.

Origin:
1640–50; < Latin: chalk < Greek gýpsos chalk, gypsum

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World English Dictionary
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

gypsum
late 14c., from L. gypsum, from Gk. gypsos "chalk," probably of Sem. origin (cf. Arabic jibs, Heb. gephes "plaster").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
gypsum   (jĭp'səm)  Pronunciation Key 
A colorless, white, or pinkish mineral. Gypsum occurs as individual blade-shaped crystals or as massive beds in sedimentary rocks, especially those formed through the evaporation of saline-rich water. It is used in manufacturing plasterboard, cement, and fertilizers. Chemical formula: CaSO4·2H2O.
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