cal·i·per also cal·li·per 
(kălə-pər)
(kălə-pər)n.
1. often calipers An instrument consisting of two hinged legs, used to measure thickness and distances.
2. A large instrument having a fixed and a movable arm on a graduated stock, used for measuring the diameters of logs and similar objects.
3. A vernier caliper.
4.
a. The assembly housing the brake pads in a disc brake.
b. The assembly in certain bicycle brakes that forces the brake pads against the wheel rim.
[Alteration of CALIBER.]
cali·per v.
caliperleft to right: spring and inside
calipers