Bible Dictionaries
Ypsum

Webster's Dictionary

(n.) A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.

Bibliography Information
Webster, Noah. Entry for 'Ypsum'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​y/ypsum.html. 1828.