wheel bug definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a large North American assassin bug (Arilus cristatus) distinguished by a high, saw-toothed crest on the prothorax: it sucks the blood of other insects
wheel bug definition by American Heritage Dictionary
A large assassin bug (Arilus cristatus) of North America that has a notched, wheellike projection on the back of the thorax and preys on other insects.