A timepiece that derives its time scale from the vibration of atoms or molecules.

Roget 114: chronometry, horometry^†, horology; date, epoch; style, era.    almanac, calendar, ephemeris; register, registry; chronicle, annals, journal, diary.    [Instruments for the measurement of time] chronogram; clock, wall clock, pendulum clock, grandfather's clock, cuckoo clock, alarm clock, clock radio; watch, wristwatch, pocket watch, stopwatch, Swiss watch; atomic clock, digital clock, analog clock, quartz watch, water clock; chronometer, chronoscope^†, chronograph; repeater; timekeeper, timepiece; dial, sundial, gnomon, horologe, pendulum, hourglass, clepsydra^†; ghurry^†.    chronographer^†, chronologer, chronologist, timekeeper; annalist.    calendar year, leap year, Julian calendar, Gregorian calendar, Chinese calendar, Jewish calendar, perpetual calendar, Farmer's almanac, fiscal year.    ... show more

Dutch: atoomklok
Polish: zegar atomowy