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gallfly

[gawl-flahy]
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noun, plural gall·flies.
  1. any of various insects that deposit their eggs in plants, causing the formation of galls.

Origin of gallfly

First recorded in 1815–25; gall3 + fly2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for gallfly

gallfly

noun plural -flies
  1. any of several small insects that produce galls in plant tissues, such as the gall wasp and gall midge
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