TURK'OIS, noun A mineral, called also calaite, brought from the east; of a beautiful light green color, occurring in thin layers, or in rounded masses, or in reniform masses, with a botryoidal surface. It is susceptible of a high polish, and is used in jewelry. It is usually written in the French manner.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI