Definition of onion noun from the Oxford Advanced American Dictionary

  

onion

 noun
noun
NAmE//ˈʌnyən//
 
[countable, uncountable]
 
jump to other results
  a round vegetable with many layers inside each other and a brown, red, or white skin. Onions have a strong smell and flavor Chop the onions finely. French onion soup
See the Oxford Advanced Learner's Dictionary entry: onion