Source : Webster's Revised Unabridged Dictionary (1913)

Allium \Al"li*um\, n. [L., garlic.] (bot.)
   A genus of plants, including the onion, garlic, leek, chive,
   etc.

Source : WordNet®

Allium
     n : large genus of perennial and biennial pungent bulbous
         plants: garlic; leek; onion; chive; sometimes placed in
         family Alliaceae as the type genus [syn: {genus Allium}]