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Definition of onion
onion
/ˈʌn.jən/
on · ion
Plural:onions
•Adjective:oniony
onion Lexical Profile
CEFR
A1
Grade
2
Tier
1
Usage
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Wordle Guess
• noun
1
An edible bulb with a pungent taste and smell, composed of several concentric layers, widely used in cooking as a vegetable or flavoring.
Example
"She carefully chopped a large white onion to add to the savory stew."
2
The biennial plant of the amaryllis family that produces the onion bulb, featuring hollow, bluish-green cylindrical leaves.
Example
"The farmer planted rows of onions in the fertile soil at the edge of the property."
Synonyms
View all synonyms for onion• Rhymes for onion
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Word Origin & Etymology
From Middle English unyon, borrowed from Old French oignon, which derived from Latin unio, meaning 'single pearl' or 'a kind of onion'.
Cite this Entry
Wordmom. (2026). Definition of Onion. In Wordmom Dictionary. Retrieved Oct 13, 2026, from https://wordmom.com/dictionary/onion