gypsum

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)

From Latin gypsum, from Ancient Greek γύψος (gúpsos). Doublet of gesso.

Minerals; limestone, gypsum, water lime, marble, salt, iron ore, copperas, alum. — A New Guide for Emigrants to the West, John Mason Peck
"These natural hollows," said Sumichrast, "often occur in gypsum mountains, but still more frequently in volcanic or calcareous masses. — Adventures of a Young Naturalist, Lucien Biart
The color of the latter is sometimes heightened by the use of a mixture of powdered gypsum and Prussian blue. — Commercial Geography: A Book for High Schools, Commercial Courses, and Business Colleges, Jacques W. (Jacques Wardlaw) Redway

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