Definitions
1.nounA turning or sliding piece which imparts motion to a rod, lever or block brought into sliding or rolling contact with it.
2.nounA curved wedge, movable about an axis, used for forcing or clamping two pieces together.
3.nounA ridge or mound of earth.
4.nounA camming device, a spring-loaded device for effecting a temporary belay in a rock crevice.