gall fly

gallfly

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

Origin:
1815–25; gall3 + fly2

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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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Encyclopedia Britannica
Encyclopedia

gall fly

any of several different species of insects that cause swelling (galls) in the tissues of the plants they feed on. This group includes gall midges and certain fruit flies (order Diptera), gall wasps (order Hymenoptera), some aphids (order Homoptera), and certain species of moths (order Lepidoptera).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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