fire engine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various large motor vehicles that carry firefighters and equipment to a fire and support extinguishing operations, as by pumping water.

from The Century Dictionary.

• noun An early name for the steam-engine.
• noun An engine designed to throw a continuous stream of water through a hose upon a conflagration, for the purpose of extinguishing it.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun firefighting A vehicle used by firefighters to pump water to fight a fire. Typically, a fire engine carries a supply of water and has the ability to connect to an external water supply.
• noun Any fire apparatus, such as a fire truck or fire engine.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of various large trucks that carry firemen and equipment to the site of a fire