gypsography

Century Dictionary and Cyclopedia

1. n. The art or practice of engraving, as inscriptions, upon natural gypsum in some one of its forms, as alabaster.
2. n. The art or practice of engraving on casts of plaster of Paris.

Wiktionary

1. n. The art or process of engraving on gypsum.

GNU Webster's 1913

1. n. The act or art of engraving on gypsum.