yellow jacket 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 several small social wasps or hornets (family Vespidae) having bright-yellow markings
yellow jacket definition by American Heritage Dictionary
Any of several small wasps of the family Vespidae that have yellow and black markings and usually nest in the ground.