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What is "onion fly"

The Collaborative International Dictionary
Onion fly

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].

    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.

Wiktionary
onion fly

n. ''Delia antiqua'', a cosmopolitan pest of crops, whose larvae or maggots feed on onions, garlic and other bulbous plants.