Noah Webster's New International Dictionary of the English Language
1. (v. t.) To dress with ornaments; to adorn; -- said especially of horses.
2. (n.) An old term rather loosely used to designate various dark-colored, heavy igneous rocks, including especially the feldspathic-augitic rocks, basalt, dolerite, amygdaloid, etc., but including also some kinds of diorite. Called also trap rock.
3. (a.) of or pertaining to trap rock; as, a trap dike.
4. (n.) A machine or contrivance that shuts suddenly, as with a spring, used for taking game or other animals; as, a trap for foxes.
5. (n.) Fig.: A snare; an ambush; a stratagem; any device by which one may be caught unawares.
6. (n.) A wooden instrument shaped somewhat like a shoe, used in the game of trapball. It consists of a pivoted arm on one end of which is placed the ball to be thrown into the air by striking the other end. Also, a machine for throwing into the air glass balls, clay pigeons, etc., to be shot at.
7. (n.) The game of trapball.
8. (n.) A bend, sag, or partitioned chamber, in a drain, soil pipe, sewer, etc., arranged so that the liquid contents form a seal which prevents passage of air or gas, but permits the flow of liquids.
9. (n.) A place in a water pipe, pump, etc., where air accumulates for want of an outlet.
10. (n.) A wagon, or other vehicle.
11. (n.) A kind of movable stepladder.
12. (v. t.) To catch in a trap or traps; as, to trap foxes.
13. (v. t.) Fig.: To ensnare; to take by stratagem; to entrap.
14. (v. t.) To provide with a trap; as, to trap a drain; to trap a sewer pipe. See 4th Trap, 5.
15. (v. i.) To set traps for game; to make a business of trapping game; as, to trap for beaver.