gypsum


Concise Oxford English Dictionary © 2008 Oxford University Press:
gypsum /ˈdʒɪpsəm/
noun a soft white or grey mineral consisting of hydrated calcium sulphate, used to make plaster of Paris and in the building industry.
– derivatives
gypsiferous /-ˈsɪf(ə)rəs/ adjective.
– origin ME: from L., from Gk gupsos.
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