billbug

[ bil-buhg ]
/ ˈbɪlˌbʌg /

noun

any of several weevils, especially of the genera Calendra and Sitophilus, that feed on various grasses.

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. 2019