faucet

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

• noun A device for regulating the flow of a liquid from a reservoir such as a pipe or drum.

from The Century Dictionary.

• noun A device fixed in a receptacle or pipe to control the flow of liquid from it by opening or closing an orifice.
• noun The enlarged end of a pipe fitted to the spigot-end of another pipe.

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

• noun A fixture for drawing a liquid, as water, molasses, oil, etc., from a pipe, cask, or other vessel, in such quantities as may be desired; -- called also tap, and cock. It consists of a tubular spout, stopped with a movable plug, spigot, valve, or slide.
• noun The enlarged end of a section of pipe which receives the spigot end of the next section.

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

• noun North America An exposed plumbing fitting; a tap or spigot; a regulator for controlling the flow of a liquid from a reservoir.

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

• noun a regulator for controlling the flow of a liquid from a reservoir