Onion

n.	1.	(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.
	2.	The flavor of an onion{1}. 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.

Noun	1.	onion - edible bulb of an onion plant
	2.	onion - bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb Synonyms: Allium cepa, onion plant
	3.	onion - an aromatic flavorful bulb

Allium cepa, bulb, onion plant