1. (noun) bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb

• allium cepa
• onion plant

1. (noun) the bulb of an onion plant

• bulb

2. (noun) bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb

• alliaceous plant

3. (noun) an aromatic flavorful vegetable

• veg
• vegetable
• veggie

1. (noun) bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb

• allium ascalonicum
• allium cepa aggregatum
• eschalot
• multiplier onion
• shallot
• allium cepa viviparum
• egyptian onion
• top onion
• tree onion
• allium fistulosum
• japanese leek
• welsh onion
• allium haematochiton
• red-skinned onion

2. (noun) an aromatic flavorful vegetable

• bermuda onion
• green onion
• scallion
• spring onion
• shallot
• spanish onion
• vidalia onion