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wheel bug

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noun
  1. an assassin bug, Arilus cristatus, that has a toothed, semicircular crest on the pronotum and preys on other insects.
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Origin of wheel bug

An Americanism dating back to 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for wheel bug

wheel bug

noun
  1. a large predatory North American heteropterous insect, Arilus cristatus, having a semicircular thoracic projection: family Reduviidae (assassin bugs)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012