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 hairspring hairspring /ˈhɛərsprɪŋ/

noun

  1. A fine spiral spring that regulates the movement of the balance wheel in a timepiece  ( hairspring )
    a fine spiral spring that regulates the movement of the balance wheel in a timepiece
     The hairspring in the watch ensures accurate timekeeping by controlling the balance wheel.
    The hairspring in the watch ensures accurate timekeeping by controlling the balance wheel.


 discretion discretion /dɪˈskrɛʃən/

noun

  1. () Freedom to act or judge on one's own  ( discretion )
    freedom to act or judge on one's own
      it is up to local authorities to use their discretion in setting the charges
    it is up to local authorities to use their discretion in setting the charges
  2. () Knowing how to avoid embarrassment or distress  ( circumspection , discreetness , prudence , discretion )
    knowing how to avoid embarrassment or distress
     The servants showed great tact and discretion
    the servants showed great tact and discretion
  3. The trait of judging wisely and objectively  ( discernment , discretion )
    the trait of judging wisely and objectively
     A man of discernment
    a man of discernment
  4. The power of making free choices unconstrained by external agencies  ( discretion , free will )
    the power of making free choices unconstrained by external agencies
  5. Refined taste; tact  ( delicacy , discretion )
    refined taste; tact


 Nicol prism Nicol prism /ˈnɪkəl prɪzm/

noun

  1. Optical device that produces plane-polarized light  ( Nicol prism )
    optical device that produces plane-polarized light
     The physics student demonstrated how the Nicol prism produced plane-polarized light.
    The physics student demonstrated how the Nicol prism produced plane-polarized light.


 warplane warplane /ˈwɔrˌpleɪn/

noun

  1. (military) an aircraft designed and used for combat  ( military plane , warplane )
    (military) an aircraft designed and used for combat