From BiblePortal Wikipedia

King James Dictionary [1]

Butt, n. See But. Literally, end, furthest point. Hence, a mark to be shot at the point where a mark is set or fixed to be shot at.

1. The point to which a purpose or effort is directed. 2. The object of aim the thing against which an attack is directed. Hence, 3. The person at whom ridicule,jests or contempt are directed as the butt of ridicule. 4. A push or thrust given by the head of an animal, as the butt of a ram also, a thrust in fencing. 5. A cask whose contents are 126 gallons of wine, or two hogsheads called also a pipe. A butt of beer  Isaiah 108 gallons, and from 1500 to 2200 weight of currants is a butt. 6. The end of a plank in a ship's side or bottom. 7. A particular kind of hinge for doors, &c.

Butt, L. peto. To thrust the head forward to strike by thrusting the head against, as an ox or a ram.

Webster's Dictionary [2]

(1): (v. t.) Alt. of But

(2): (n.) The common English flounder.

(3): (n.) A large cask or vessel for wine or beer. It contains two hogsheads.

(4): (v. i.) To join at the butt, end, or outward extremity; to terminate; to be bounded; to abut.

(5): (v. i.) To thrust the head forward; to strike by thrusting the head forward, as an ox or a ram. [See Butt, n.]

(6): (v. t.) To strike by thrusting the head against; to strike with the head.