gypsum Hear it!

gypsum definition

gyp·sum (jip′səm)

noun

a very soft, monoclinic mineral, CaSO·2HO, commonly found with other evaporites in sedimentary rock and used to make plaster of Paris and cement; hydrous calcium sulfate

Etymology: ME < L < Gr gypsos, chalk, gypsum < Sem

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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