Gypsum; plaster. Obsolete.

= plaster of Paris, n.

= plaster rock n.

= gypsum, n.

Plaster of Paris; gypsum. in the native state (obsolete).

Hydrous calcium sulphate, the mineral from which plaster of Paris is made.

= gypsum, n.

gypsum from the Paris basin.

naturally occurring gypsum.

A hydrous phosphate of lime occurring in small crystals in the rock guano of Aves Island and Sombrero in the Caribbean Sea.