callipers - definition and synonyms

noun [plural] 

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/ˈkælɪpə(r)z/
  1. 1
    a tool consisting of two long narrow pieces of metal joined at one end, used for measuring the diameter (=width) of a round object or a tube
  2. 2
    British a pair of metal objects that someone wears around their legs to help them to walk. The American word is braces.