noun, plural gallflies.
any of various insects that deposit their eggs in plants, causing the formation of galls.

1815–25; gall3 + fly2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gallfly (ˈɡɔːlˌflaɪ)
n , pl -flies
any of several small insects that produce galls in plant tissues, such as the gall wasp and gall midge

Collins English Dictionary - Complete & Unabridged 10th Edition
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