Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “onion”

onion

noun [C or U] uk   /ˈʌn.jən/ us  
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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of onion?
Add Cambridge dictionaries to your browser to your website

Definitions of “onion” in other dictionaries

Word of the Day

nip

to press something quickly and quite hard between two objects, especially sharp objects such as teeth or nails

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More