Onion
Pronunciation : On"ion
Part of Speech : n.
Etymology : [F. ognon, fr. L. unio oneness, unity, a single large pearl, an onion. See One, Union.] (Bot.)
Definition : Defn: A liliaceous plant of the genus Allium (A.cepa), having a strong-flavored bulb and long hollow leaves; also, its bulbous root, much used as an article of food. The name is often extended to other species of the genus. Onion fish (Zo?l.), the grenadier. -- Onion fly (Zo?l.) a dipterous insect whose larva feeds upon the onion; especially, Anthomyia ceparum and Ortalis flexa. -- Welsh onion. (Bot.) See Cibol. -- Wild onion (Bot.), a name given to several species of the genus Allium.
Source : Webster's Unabridged Dictionary, 1913