Allium

n. any of a number of strong smelling bulbous plants belonging to the lily family (including garlic, onion, etc.)

Allium is the onion genus, with about 1250 species, making it one of the largest plant genera in the world. They are perennial bulbous plants that produce chemical compounds that give them a characteristic onion or garlic taste and odor, and many are used as food plants. Allium is classified in family Alliaceae although some classifications have included it in the lily family (Liliaceae).
See more at Wikipedia.org...

Noun
1. large genus of perennial and biennial pungent bulbous plants: garlic; leek; onion; chive; sometimes placed in family Alliaceae as the type genus
(synonym) genus Allium
(hypernym) liliid monocot genus
(member-holonym) Liliaceae, family Liliaceae, lily family
(member-meronym) alliaceous plant

n. allium, any of a number of strong smelling bulbous plants belonging to the lily family

(n.)
A genus of plants, including the onion, garlic, leek, chive, etc.