atomic clock

Noun
  1. A timepiece that derives its time scale from the vibration of atoms or molecules (synset 102756399)
    is a type of: horologe, timekeeper, timepiece - a measuring instrument or device for keeping time
    subtypes:
    • ammonia clock - an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule
    • caesium clock - an atomic clock based on the energy difference between two states of the caesium nucleus in a magnetic field

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