from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of a group of gypsum cements, essentially hemihydrated calcium sulfate, CaSO4· 1/2 H2O, a white powder that forms a paste when it is mixed with water and then hardens into a solid, used in making casts, molds, and sculpture.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
hemihydrateof calcium sulfate, made by calcining gypsum, that hardens when moistened and allowed to dry; used to make casts, moldsor sculpture
from The American Heritage® Dictionary of the English Language, 4th Edition
[Middle English, after Paris, France.]
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