GNU Collaborative International Dictionary of English

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1.       
   Onion , n. [F. ognon, fr. L. unio oneness, unity, a single large pearl, an onion. See One, Union.]
   (Bot.) A liliaceous plant of the genus Allium (Allium 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.
   1913 Webster
   The flavor of an onion{1}.
   PJC
   Onion fish (Zool.), the grenadier. -- Onion fly (Zool.) 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.
   1913 Webster