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gypsum

[jip-suh m] /ˈdʒɪp səm/
noun
1.
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
1640-1650
1640-50; < Latin: chalk < Greek gýpsos chalk, gypsum
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for gyp sum

gypsum

/ˈdʒɪpsəm/
noun
1.
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
Derived Forms
gypseous (ˈdʒɪpsɪəs) adjective
gypsiferous (dʒɪpˈsɪfərəs) adjective
Word Origin
C17: from Latin, from Greek gupsos chalk, plaster, cement, of Semitic origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for gyp sum

gypsum

n.

substance (hydrated calcium sulphate) used in making plaster, late 14c., from Latin gypsum, from Greek gypsos "chalk," according to Klein, perhaps of Semitic origin (cf. Arabic jibs, Hebrew gephes "plaster").

Online Etymology Dictionary, © 2010 Douglas Harper
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gyp sum in Science
gypsum
  (jĭp'səm)   
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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