carburetor

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

• noun A device used in internal-combustion engines to produce an explosive mixture of vaporized fuel and air.
• noun A small hole in the side of a bong or water pipe that is stopped with a finger and then quickly unstopped as a person is inhaling to force smoke out of the drawing end of the pipe.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) An apparatus in which coal gas, hydrogen, or air is passed through or over a volatile hydrocarbon, in order to confer or increase illuminating power.
• noun One that carburets; specif., an apparatus in which air or gas is carbureted, as by passing it through a light petroleum oil. The carburetor for a gasoline engine is usually either a surface carburetor, or alternatively a float carburetor (called also float-feed carburetor, or spray carburetor). In the former air is charged by being passed over the surface of gasoline. In the latter a fine spray of gasoline is drawn from an atomizing nozzle by a current of air induced by the suction of the engine piston, the supply of gasoline being regulated by a float which actuates a needle valve controlling the outlet of the feed pipe. Alcohol and other volatile inflammable liquids may be used instead of gasoline.

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

• noun US A device in an internal combustion engine where fuel is vaporized and mixed with air prior to ignition.

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

• noun mixes air with gasoline vapor prior to explosion