onion

Definition of Onion in English :

1. onion

the bulb of an onion plant

bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb

3. onion

an aromatic flavorful vegetable

WordNet Lexical Database for English. Princeton University. 2010.

Onion

noun

1.

an alliaceous plant, Allium cepa, having greenish-white flowers: cultivated for its rounded edible bulb

2.

the bulb of this plant, consisting of concentric layers of white succulent leaf bases with a pungent odour and taste

3.

any of several related plants similar to A. cepa, such as A. fistulosum (Welsh onion)

4. know one's onions

noun

1.

a plant (Allium cepa) of the lily family, having an edible bulb with a strong, sharp smell and taste

2.

the bulb of this plant, formed of close, concentric layers of leaf bases

3.

any of various related plants

n.

1.

a. A bulbous plant (Allium cepa) cultivated worldwide as a vegetable.

b. The rounded edible bulb of this plant, composed of fleshy, tight, concentric leaf bases having a pungent odor and taste.

2. Any of several other plants in the genus Allium.