Plaster stone

any species of gypsum. See Gypsum.

See also: Plaster

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The Sun Trust was en route from Shizuoka in central Japan to Pusan, South Korea, with a cargo of plaster stone. The Koyo Maru was heading to Kimitsu, Chiba Prefecture from Aichi Prefecture.