butt

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

• intransitive verb To hit or push against with the head or horns; ram.
• intransitive verb To hit or push something with the head or horns.
• intransitive verb To project forward or out.
• noun A push or blow with the head or horns.
• noun A large cask.
• noun A unit of volume equal to two hogsheads, usually the equivalent of 126 US gallons (about 477 liters).
• transitive & intransitive verb To join or be joined end to end; abut.
• noun A butt joint.
• noun A butt hinge.
• noun One that serves as an object of ridicule or contempt.
• noun A target, as in archery or riflery.
• noun A target range.
• noun An obstacle behind a target for stopping the shot.
• noun An embankment or hollow used as a blind by hunters of wildfowl.
• noun Archaic A goal.
• noun Obsolete A bound; a limit.
• noun The larger or thicker end of an object.
• noun An unburned end, as of a cigarette.
• noun Informal A cigarette.
• noun A short or broken remnant; a stub.
• noun Informal The buttocks; the rear end.
• adverb Slang Very. Used as an intensive.

from The Century Dictionary.

• noun A push or thrust given by the head of an animal: as, the butt of a ram.
• noun A thrust in fencing.
• To strike by thrusting, as with the end of a beam or heavy stick, or with the horns, tusks, or head, as an ox, a boar, or a ram; strike with the head.
• To strike anything by thrusting the head against it, as an ox or a ram; have a habit of striking in this manner.
• To join at the end or outward extremity; abut; be contiguous.
• Specifically, in ship-building, to abut end to end; fit together end to end, as two planks.
• Also spelled but.
• To lay down bounds or limits for.
• To cut off the ends of, as boards, in order to make square ends or to remove faulty portions.
• To abut. See butt, verb, II., 2, 3.
• Also spelled but.
• noun The end or extremity of a thing.
• noun In ship-building, the end of a plank or piece of timber which exactly meets another endwise in a ship's side or bottom; also, the juncture of two such pieces.
• noun In machinery, the square end of a connecting-rod or other link, to which the bush-bearing is attached.
• noun In carpentry, a door-hinge consisting of two plates of metal, or leaves, which interlock so as to form a movable joint, being held together by a pin or pintle.
• noun In agriculture: A ridge in a plowed field, especially when not of full length. Hence— A gore or gare. plural A small detached or disjoined parcel of land left over in surveying.
• noun In the leather trade, a hide of sole-leather with the belly and shoulders cut off; a rounded crop.
• noun A hassock.
• noun The standing portion of a half-coupling at the end of a hose; the metallic ring at the end of the hose of a fire-engine, or the like, to which the nozle is screwed.
• noun In target-shooting: In archery, a mark to shoot at. In rifle-practice, a wooden target composed of several thicknesses of boards, with small spaces between them, so that the depth to which bullets penetrate can be ascertained. In gunnery, a solid embankment of earth or sand into which projectiles are fired in testing guns, or in making ballistic experiments. plural The range or place where archery, rifle, or gunnery practice is carried on, in distinction from the field. See target.
• noun A person or thing that serves as a mark for shafts of wit or ridicule, or as an object of sarcastic or contemptuous remarks.