Onion definition

ŭnyən
Frequency:
A plant (Allium cepa) of the lily family, having an edible bulb with a strong, sharp smell and taste.
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Any of several other plants in the genus Allium.
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A bulbous plant (Allium cepa) cultivated worldwide as a vegetable.
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The rounded edible bulb of this plant, composed of fleshy, tight, concentric leaf bases having a pungent odor and taste.
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A monocotyledonous plant of genus Allium allied to garlic, used as vegetable and spice.
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The bulb of such a plant.
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(uncountable) The genus as a whole.
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(colloquial, chiefly archaic) A person from Bermuda or of Bermudian descent.
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The bulb of this plant, formed of close, concentric layers of leaf bases.
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Any of various related plants.
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Other Word Forms

Noun

Singular:
onion
Plural:
onions

Origin of onion

  • Middle English oinyon from Old French oignon from Latin uniō uniōn-

    From American Heritage Dictionary of the English Language, 5th Edition

  • Middle English onyon, union, oinyon, from Anglo-Norman union et al. and Old French oignon, from Latin Å«niōnem, accusative of Å«niō (“onion, large pearl") (probably from Å«nus (“one"), but perhaps compare Hittite wašḫar (“garlic"), Sanskrit उष्ण (uṣṇa, “onion"), Pashto ووږه (ūža, “garlic"), Khowar wǝẓnÅ« (“garlic")). Displaced the inherited term ramsons.

    From Wiktionary