onion

noun

on·​ion ˈən-yən 

plural onions

1

: a widely cultivated Asian herbaceous plant (Allium cepa) of the amaryllis family that has a pungent edible bulb and that is closely related to the garlic, chive, and leek

also : its bulb

2

: any of various usually ornamental alliums (such as Allium amplectens or A. caeruleum) related to the onion

oniony

ˈən-yə-nē 

adjective

an oniony flavor

oniony meatloaf

Examples of onion in a Sentence

The recipe calls for chopped onions.

He is growing onions in the garden this year.

The recipe calls for chopped onion.

Recent Examples on the Web

For a nutrient-dense meal option, top your cauliflower crust with items such as tomato sauce, mushrooms, onions, fresh basil, and cheese or cheese alternatives. 5. —Jonathan Purtell, Verywell Health, 5 Mar. 2025

Place the tomatillos, chiles, onion, cilantro and garlic in a blender, add the water and purée until smooth. 4. —Angelica Stabile, Fox News, 3 Mar. 2025

Garlic and onions were banned because her father didn’t like them. —Anna North, Vox, 27 Feb. 2025

Tuesday, March, 11, Beef Stew with carrots, potatoes, onions and celery, whole grain roll, Romaine salad and tomatoes, Mandarin oranges, milk. —Ramona Sentinel, San Diego Union-Tribune, 25 Feb. 2025

Word History

Etymology

Middle English, from Anglo-French oignon, from Latin union-, unio

First Known Use

14th century, in the meaning defined at sense 1

Phrases Containing onion

• Bermuda onion
• green onion
• onion dome
• onion ring
• pearl onion
• sea onion
• Spanish onion
• spring onion

Rhymes for onion

• trunnion

Kids Definition

onion

noun

on·​ion ˈən-yən 

: a widely grown Asian herb related to the lilies and having edible bulbs that have a sharp odor and taste and are used as a vegetable and to season foods

also : its bulb