any of a family (Chloropidae) of tiny dipterous flies whose larvae destroy grain, esp. a black species (Oscinella frit)
Origin:
< ? frit, from the glazed, shining appearance of the fly's body
See frit fly in American Heritage Dictionary 4
noun
Any of several small flies of the family Chloropidae, especially Oscinella frit, having larvae that are destructive to cereal plants such as oats and wheat.