GATCH

Etymology

Noun

gatch (uncountable)

A form of plaster of Paris formerly used in Persia

Source: Wiktionary

Gatch, n. [Per. gach mortar.]

Definition: Plaster as used in Persian architecture and decorative art.

Gatch decoration, decoration in plaster often producing design of great beauty. -- Gatch work, work in which gatch is employed; also, articles of gatch ornamentation collectively.

Source: Webster’s Unabridged Dictionary 1913 Edition