Pronunciation: (kal'u-pur),[key] —n. 1. Usually, calipers. an instrument for measuring thicknesses and internal or external diameters inaccessible to a scale, consisting usually of a pair of adjustable pivoted legs.
2. any of various calibrated instruments for measuring thicknesses or distances between surfaces, usually having a screwed or sliding adjustable piece. Cf. vernier caliper. 3. thickness or depth, as of paper or a tree.
4. Usually, calipers. the pincers of an earwig.
5. Auto.the part of a disc-brake assembly that straddles the disc and presses the brake pads against it. See illus. under disc brake. 6. a similar part used with a hand brake on a bicycle.