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English definition of “onion”

onion

noun [C or U]     /ˈʌn.jən/
A2 a vegetable with a strong smell and flavour, made up of several layers surrounding each other tightly in a round shape, usually brown or red on the outside and white inside: I always cry when I'm chopping onions. Fry the onion and garlic for about two minutes.Types of vegetablePlants in general
(Definition of onion noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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