Wiktionary
prasine
a. (context now rare English) leek-green. (from 14th c.) n. 1 (context obsolete English) A green gem; an emerald. (14th-16th c.) 2 (context obsolete English) A type of green pigment. (14th-17th c.) 3 (context mineralogy English) pseudomalachite. (from 19th c.)