One of the mysteries of the English language finally explained.
A trivalent group or radical consisting of a carbon and a hydrogen atom, specifically the group =CH—; also called methene or methenyl. Also (especially in Dye Chemistry): designating a dye, pigment, etc., containing one or more such groups.
Late 19th century; earliest use found in Henry Roscoe (1833–1915), chemist and university administrator. From meth- + -ine.
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