Onion
WordNet
noun
(1) An aromatic flavorful bulb
(2) Bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
(3) Edible bulb of an onion plant
WiktionaryText
Etymology
onyon, union, oinyon from union from oignon, oingnon from ūniōnem, accusative of ūniō "onion, large pearl", lit. "a unity, a oneness" from ūnus "one". Displaced the usual Indo-European term for onion, native ramsyn, ramsen "onion, leek" (from hramsa, from , from ).