plaster of Paris

== English == === Alternative forms === plaster-of-Paris (attributive use) === Etymology === So named after a large gypsum deposit at Montmartre, Paris. === Pronunciation === === Noun === plaster of Paris (uncountable) A hemihydrate of calcium sulfate, made by calcining gypsum, that hardens when moistened and allowed to dry; used to make casts, molds and sculpture. Synonyms: gypsum plaster, plaster (ellipsis) ==== Translations ==== === Further reading === Gypsum plaster on Wikipedia.Wikipedia