gudgeon

from The Century Dictionary.

• noun Eleotris coxii, a gobioid fish of New South Wales.
• noun The large pivot of the axis of a wheel.
• noun In machinery, that part of a horizontal shaft or axle which turns in the collar.
• noun In ship-building: One of several clamps, of iron or other metal, bolted to the stern-post of a ship or boat for the rudder to hang on.
• noun One of the notches in the carrick-bits for receiving the metal bushes in which the spindle of a windlass traverses.
• noun A metallic pin used for securing together two blocks or slabs, as of stone or marble.
• noun A piece of wood used for roofing.
• noun A small European fresh-water fish, Gobio fluviatilis, of the family Cyprinidœ. It is easily caught, and is used for bait. See cut under Gobio.
• noun Hence A person easily cheated or insnared.
• noun A bait; an allurement; something used to deceive or entrap a person; a cheat; a lie.
• Resembling a gudgeon; foolish; stupid.
• To insnare; cheat; impose on.

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

• noun (Zoöl.) A small European freshwater fish (Gobio fluviatilis), allied to the carp. It is easily caught and often used for food and for bait. In America the killifishes or minnows are often called gudgeons.
• noun What may be got without skill or merit.
• noun A person easily duped or cheated.
• noun (Mach.) The pin of iron fastened in the end of a wooden shaft or axle, on which it turns; formerly, any journal, or pivot, or bearing, as the pintle and eye of a hinge, but esp. the end journal of a horizontal.
• noun (Naut.) A metal eye or socket attached to the sternpost to receive the pintle of the rudder.
• noun See under Ball.
• transitive verb rare To deprive fraudulently; to cheat; to dupe; to impose upon.

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

• noun A small freshwater fish, Gobio gobio, that is native to Eurasia.
• noun Any of various similar small fish of the family Eleotridae, often used as bait.
• noun An idiot.
• noun A type of bearing: a circular fitting, often made of metal, which is fixed onto some surface and allows for the pivoting of another fixture.
• noun nautical Specifically, in a vessel with a stern-mounted rudder, the fitting into which the pintle of the rudder fits to allow the rudder to swing freely.
• verb To deprive fraudulently; to cheat; to dupe.

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

• noun small slender European freshwater fish often used as bait by anglers
• noun small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker