Meaning of plaster of Paris

plas'ter of Par'is

Pronunciation: [key]
  1. calcined gypsum in white, powdery form, used as a base for gypsum plasters, as an additive of lime plasters, and as a material for making fine and ornamental casts: characterized by its ability to set rapidly when mixed with water.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.