aerial ladder(n = noun.artifact) - mechanically extendible ladder; used on a fire truck;
is a kind of extension ladder

N  insulation, fire extinction, insulation, incombustible material, noncombustible material, fire retardant, flame retardant, fire wall, fire door, incombustibility, incombustibleness, extincteur, fire annihilator, amianth, amianthus, earth-flax, mountain-flax, asbestos, fireman, fire fighter, fire eater, fire department, fire brigade, engine company, pumper, fire truck, hook and ladder, aerial ladder, bucket, fire hose, fire hydrant, backfire, firebreak, trench, aerial water bombardment, wet blanket, fire extinguisher, soda and acid extinguisher, dry chemical extinguisher, CO-two extinguisher, carbon tetrachloride, foam, sprinklers, automatic sprinkler system, fire bucket, sand bucket, fire alarm, evacuation alarm, fire code, fire regulations, fire, fire inspector, code violation, citation, incombustible, nonflammable, uninflammable, unflammable, fireproof, fight fire with fire.

accommodation ladder, aerial, aerial ladder truck, aerial torpedo, aerial tramway, dish aerial, extension ladder, fish ladder, hook and ladder, hook and ladder truck, jack ladder, jacob's ladder, ladder, ladder company, ladder truck, monkey ladder, northern jacob's ladder, pilot ladder, radio aerial, rope ladder, scaling ladder, sea ladder, step ladder, transmitting aerial, yagi aerial