A firetrucks aerial ladder extended to a building.
aerial ladder 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 ladder that can be extended for reaching high places, esp. one mounted on a fire engine
aerial ladder definition by American Heritage Dictionary
A ladder that can be extended to reach high places, especially one mounted on a fire engine.