洋葱

[ noun ]
bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
<noun.plant>

Onion \On"ion\, n. [F. ognon, fr. L. unio oneness, unity, a
single large pearl, an onion. See {One}, {Union}.]
1. (Bot.) A liliaceous plant of the genus {Allium} ({Allium
cepa}), having a strong-flavored bulb and long hollow
leaves; also, its bulbous root, much used as an article of
food. The name is often extended to other species of the
genus.

2. The flavor of an onion[1].
[PJC]

{Onion fish} (Zo["o]l.), the grenadier.

{Onion fly} (Zo["o]l.) a dipterous insect whose larva feeds
upon the onion; especially, {Anthomyia ceparum} and
{Ortalis flexa}.

{Welsh onion}. (Bot.) See {Cibol}.

{Wild onion} (Bot.), a name given to several species of the
genus {Allium}.