ONION
onion
(noun) an aromatic flavorful vegetable
onion, onion plant, Allium cepa
(noun) bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
onion
(noun) the bulb of an onion plant
Source: WordNet® 3.1
Etymology
Noun
onion (plural onions)
A monocotyledonous plant (Allium cepa), allied to garlic, used as vegetable and spice.
The bulb of such a plant.
(uncountable) The genus as a whole.
(obsolete baseball slang) A ball.
(colloquial, chiefly, archaic) A person from Bermuda or of Bermudian descent.
Synonyms
• (vegetable): violet (UK dialect)
Source: Wiktionary
On"ion, n. Etym: [F. ognon, fr. L. unio oneness, unity, a single
large pearl, an onion. See One, Union.] (Bot.)
Definition: 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 (Zoöl.), the grenadier.
– Onion fly (Zoöl.) 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 Edition