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greenbug

[green-buhg]
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noun
  1. a pale-green aphid, Schizaphis graminum, of North America, destructive of wheat, other small grains, and alfalfa.
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Origin of greenbug

First recorded in 1705–15; green + bug1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018