D defs.my
Entry 2 senses Webster, 1913

oscillator

/(ŏs"sĭl*lā`tẽr)/ · os·cil·la·tor · IPA /ˈɑsəlˌeɪtər/
01 n. One that oscillates
  1. 1.
    One that oscillates(Electronics)
  2. 2.
    An instrument for measuring rigidity by the torsional oscillations of a weighted wire.(Mech.)