katydid 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 large, green orthopteran insects (esp. family Tettigoniidae) having long, slender antennae and long hind legs: the male has highly developed stridulating organs on the forewings, that produce a shrill sound
Origin: echoic of the sound made by the males
katydid definition by American Heritage Dictionary
Any of various green insects of the family Tettigoniidae related to the grasshoppers and the crickets, the male of which produces a shrill sound by rubbing together specialized organs on the forewings.
Origin: Imitative of its sound.