Noun onion has 3 senses
  1. onion - edible bulb of an onion plant
    --1 is a kind of
    bulb
    --1 is a part of onion, onion plant, Allium cepa
  2. onion, onion plant, Allium cepa - bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
    --2 is a kind of alliaceous plant
    --2 has parts: onion
    --2 has substances: isothiocyanate
    --2 has particulars:
     shallot, eschalot, multiplier onion, Allium cepa aggregatum, Allium ascalonicum; tree onion, Egyptian onion, top onion, Allium cepa viviparum; Welsh onion, Japanese leek, Allium fistulosum; red-skinned onion, Allium haematochiton
  3. onion - an aromatic flavorful bulb
    --3 is a kind of
    vegetable, veggie
    --3 has particulars:
     Bermuda onion; green onion, scallion; Vidalia onion; Spanish onion; spring onion; shallot
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