Noun onion plant has 1 sense
  1. onion, onion plant, Allium cepa - bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
    --1 is a kind of alliaceous plant
    --1 has parts: onion
    --1 has substances: isothiocyanate
    --1 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
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