robber fly 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.
any of a large family (Asilidae) of hairy dipterous flies of varying size that prey on other insects
robber fly definition by American Heritage Dictionary
Any of various predatory flies of the family Asilidae, characteristically having long, bristly legs.