'Onion' definitions:

Definition of 'onion'

From: WordNet
noun
The bulb of an onion plant
noun
Bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb [syn: onion, onion plant, Allium cepa]
noun
An aromatic flavorful vegetable

Definition of 'Onion'

From: Easton
  • Onion The Israelites in the wilderness longed for the "onions and garlick of Egypt" (Num. 11:5). This was the _betsel_ of the Hebrews, the Allium cepe of botanists, of which it is said that there are some thirty or forty species now growing in Palestine. The onion is "the 'undivided' leek, _unio_, _unus_, one."