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WordReference Random House Learner's Dictionary of American English © 2024on•ion /ˈʌnyən/USA pronunciation n. [countable]- Plant Biologya plant of the amaryllis family, having a white or yellow, strong-smelling bulb that can be eaten.
- Plant Biologythis bulb, used in cooking.
WordReference Random House Unabridged Dictionary of American English © 2024on•ion (un′yən),USA pronunciation n. - Plant Biologya plant, Allium cepa, of the amaryllis family, having an edible, succulent, pungent bulb.
- Plant Biologyany of certain similar plants.
- Plant Biologythe bulb of the onion plant.
- the flavor or odor of this bulb.
- Slang Termsa person:He's a tough onion.
- Idioms know one's onions, [Slang.]to know one's subject or business thoroughly;
be capable or proficient.
adj. - containing or cooked with onions:onion soup.
- of, pertaining to, or resembling an onion.
- Latin ūniōn- (stem of ūniō) a unity, large pearl, onion; see union
- Old French oignon
- Middle English onyon 1325–75
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