One of the mysteries of the English language finally explained.
More fully "green ebony wood". The hard greenish wood of any of several tropical trees; especially (a) that of the South American tree Jacaranda mimosifolia, formerly used as a dyewood; (b) that of the ebony, Diospyros melanoxylon, found chiefly in southern India and Sri Lanka.
Mid 17th century; earliest use found in Robert Hooke (1635–1703), natural philosopher. From green + ebony.
green ebony/ˌɡriːn ˈɛb(ə)ni//ˌɡriːn ˈɛbəni/
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