Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
any of various ground beetles (esp. genus Brachinus) that protect themselves by discharging an irritating fluid that vaporizes with a popping sound on contact with the air
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of various beetles of the genus Brachinus and related genera that expel an acrid, volatile secretion from the abdomen when disturbed, making an audible sound.