onion

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onion [noun]
US /ˈʌn.jən/ 
UK /ˈʌn.jən/ 
Example: 

red onions

Oxford Essential Dictionary

onion

 noun
a round vegetable with many layers and a strong smell. Cutting onions can make you cry.

Longman Dictionary of Contemporary English

onion

onion S3 /ˈʌnjən/ BrE AmE noun [uncountable and countable]
[Date: 1100-1200; Language: Old French; Origin: oignon, from Latin unio]
a round white vegetable with a brown, red, or white skin and many layers. Onions have a strong taste and smell:
Chop the onions finely.
red onions
home-made onion soup

Oxford Advanced Learner's Dictionary

onion

onion [onion onions]   [ˈʌnjən]    [ˈʌnjən]  noun

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  
Word Origin:
Middle English: from Old French oignon, based on Latin unio(n-), denoting a kind of onion.  
Example Bank:
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

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

onion / ˈʌn.jən / noun [ C or U ]

onion

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.

© Cambridge University Press 2013

Collins Advanced Learner’s English Dictionary

onion

/ʌnjən/
(onions)

An onion is a round vegetable with a brown skin that grows underground. It has many white layers on its inside which have a strong, sharp smell and taste.
It is made with fresh minced meat, cooked with onion and a rich tomato sauce.

N-VAR

Merriam-Webster's Advanced Learner's Dictionary

onion
on·ion /ˈʌnjən/ noun, pl -ions : a round vegetable that is usually white, yellow, or red and has a strong smell and taste

[count]

• The recipe calls for chopped onions.
• He is growing onions in the garden this year.

[noncount]

• The recipe calls for chopped onion.