A child with his hands on the armrest of a chair.
armrest 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 support on which to rest one's arm, as on the inside of an automobile door
armrest definition by American Heritage Dictionary
A support for the arm, as on a piece of furniture or within a motor vehicle.