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Definition of onion noun from the Oxford Advanced Learner's Dictionary

picture of an onion

onion

noun

onion pronunciation English

ˈʌnjən

onion pronunciation American

ˈʌnjən

[countable, uncountable]

a round vegetable with many layers inside each other and a brown, red or white skin. Onions have a strong smell and flavour

Chop the onions finely.French onion soup