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billbug

[bil-buhg]
noun
  1. any of several weevils, especially of the genera Calendra and Sitophilus, that feed on various grasses.
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Origin of billbug

An Americanism dating back to 1860–65; bill2 + bug1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018