juvenile hormone 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 hormone secreted by insects that regulates growth and metamorphosis and which must be absent for the emergence of an adult: used to inhibit insect growth, as for preventing insect reproduction
juvenile hormone definition by American Heritage Dictionary
A hormone in arthropod larvae that inhibits ecdysone, thereby preventing molting and the development of larvae into adults until its level drops.