onion /ˈʌn.jən/ noun [C or U]
► 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.Thesaurus+: ↑Types of vegetable , ↑Plants in general• • •
Extra Examples:» Lightly brown the onion before adding the tomatoes.» Fry the onions till they start to colour.» You should have seen the onions he grew for the competition - they were monsters!» The onions had been pickled in brine.» Roughly chop the tomatoes and add to the onions.