D defs.my
Entry 2 senses Webster, 1913

Onion

/ŭn'-yən/ · On·ion · IPA /ˈʌn.jən/
01 n. A liliaceous plant of the genus Allium (Allium cepa), having a strong-flavored bulb and long hollow leaves; also, its bulbous root, much us…
  1. 1.
    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.(Bot.)
  2. 2.
    The flavor of an onion{1}.
Phrases & compounds
Onion fish — the grenadier.
Onion fly — a dipterous insect whose larva feeds upon the onion; especially, Anthomyia ceparum and Ortalis flexa.
Welsh onion — See Cibol.
Wild onion — a name given to several species of the genus Allium.