atomic clock

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noun

: a special kind of clock that is extremely exact

Full Definition of ATOMIC CLOCK

:  a precision clock that depends for its operation on an electrical oscillator regulated by the natural vibration frequencies of an atomic system (as a beam of cesium atoms)

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First Known Use of ATOMIC CLOCK

1938

Rhymes with ATOMIC CLOCK

against the clock, around-the-clock, capital stock, Czechoslovak, electroshock, grandfather clock, insulin shock, out of wedlock, poison hemlock, Pontianak, turn back the clock, Vladivostok