calliper

noun

/ˈkælɪpə(r)/

/ˈkælɪpər/

(British English)

(also caliper North American English, British English)

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callipers
[plural] an instrument with two long thin parts joined at one end, used for measuring the diameter of tubes and round objects (= the distance across them)卡钳，测径器，两脚规，卡尺（用于测量管子、圆形物体的直径）
- a pair of callipers一把测径规
(British English)
(North American English brace)
[countable, usually plural] a metal support for weak or injured legs双脚规形夹（支撑无力或受伤的腿的金属支架）