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

  

onion

 noun
noun
BrE BrE//ˈʌnjən//
 
; NAmE NAmE//ˈʌnjən//
 
[countable, uncountable] Vegetables
 
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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 See related entries: Vegetables Word Origin Middle English: from Old French oignon, based on Latin unio(n-), denoting a kind of onion.Extra examples Garnish with a little chopped onion. Put the chopped onion and garlic in the pan… a jar of pickled onions cheese and onion flavoured crisps sage and onion stuffing the onion domes of St Basil’s Cathedral
See the Oxford Advanced American Dictionary entry: onion