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Definitions for Onion

[1] a plant, Allium cepa, of the amaryllis family, having an edible, succulent, pungent bulb.
[2] any of certain similar plants.
[3] the bulb of the onion plant.
[4] the flavor or odor of this bulb.
[5] Slang . a person: He's a tough onion.
[6] containing or cooked with onions: onion soup.
[7] of, relating to, or resembling an onion.
[8] know one's onions , Slang . to know one's subject or business thoroughly; be capable or proficient.
[9] an alliaceous plant, Allium cepa, having greenish-white flowers: cultivated for its rounded edible bulb
[10] the bulb of this plant, consisting of concentric layers of white succulent leaf bases with a pungent odour and taste
[11] any of several related plants similar to A. cepa, such as A. fistulosum (Welsh onion)
[12] know one's onions British slang to be fully acquainted with a subject

Words nearby Onion

ongoings, oni, onie, onigiri, oniomania, onion, onion dome, onion fly, onion rings, onion snow, onion weed

Origin of Onion

1325–75; Middle English onyon < Old French oignon < Latin ūniōn- (stem of ūniō ) a unity, large pearl, onion; see union

Other words from Onion

on·ion·like , adjective
on·ion·y , adjective

Word origin for Onion

C14: via Anglo-Norman from Old French oignon, from Latin unio onion, related to union