a minute European fly, Oscinella frit, the larvae of which are serious pests of wheat and other cereals.
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British Dictionary definitions for frit fly
a small black dipterous fly, Oscinella frit, whose larvae are destructive to barley, wheat, rye, oats, etc: family Chloropidae
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012