Толковый словарь английского языка Oxford English Reference - calliper

n. & v. (also caliper) --n. 1 (in pl.) (also calliper compasses) compasses with bowed legs for measuring the diameter of convex bodies, or with out-turned points for measuring internal dimensions. 2 (in full calliper splint) a metal splint to support the leg. --v.tr. measure with callipers. Etymology: app. var. of CALIBRE