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gallfly

[gawl-flahy] /ˈgɔlˌflaɪ/
noun, plural gallflies.
1.
any of various insects that deposit their eggs in plants, causing the formation of galls.
Origin
1815-1825
1815-25; gall3 + fly2
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for gall fly

gallfly

/ˈɡɔːlˌflaɪ/
noun (pl) -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
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Encyclopedia Article for 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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