D defs.my
Entry 1 sense Webster, 1913

Diadrom

· Di·a·drom · IPA /ˈdaɪədɹəm/
01 n. A complete course or vibration; time of vibration, as of a pendulum.
  1. 1.
    A complete course or vibration; time of vibration, as of a pendulum.[Obs.]