Definition of electric clock
: any of various clocks operated by electricity: a : a clock having a spring or weighted arm that is wound at regular intervals by an electric motor b : a clock whose pendulum is kept in vibration by electromagnetic impulse c : one of a system of electrically operated clocks consisting of a master clock and a number of sympathetic clocks d : a clock connected with an electromagnetic recording apparatus e : a clock having neither pendulum nor balance, consisting simply of a small alternating-current motor that drives the clock hands through a reducing train of gearing, and telling time by current controlled at the generator to a definite rate of alternations per second
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