1580s, "pertaining to Nemea," a wooded valley in the northern Argolis, from Greek nemos "grove, forest," from PIE *nemos (source also of Latin nemus "forest, (holy) wood" and the Celtic word for "(holy) wood, sanctuary" preserved in Gaulish nemeton, Old Irish nemed). Especially in reference to the lion there, which was said to have been killed by Herakles as one of his 12 labors. The Nemean Games were one of the four great national festivals of the ancient Greeks. The victor's garland was made of parsley.
by 1953, name for human anti-coagulant use of the rat poison warfarin sodium, abstracted from the chemical name, 3-(α-acetonylbenzyl)-4-hydroxycoumarin; earlier known as Dicoumarol, it attained publicity when it was used in 1955 to treat U.S. President Dwight Eisenhower after a heart attack. Coumarin as the name of an aromatic crystalline substance is by 1830 in English, from French coumarine, from coumarou, the native name in Guyana of the tonka or tonquin bean, one source of the substance.