atomic clock 1
noundomain: artefact
Princeton WordNet [ver.3.1]
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EnglishDefinition
a timepiece that derives its time scale from the vibration of atoms or molecules
Hypernym
timepiece 1
noun
a measuring instrument or device for keeping time
EnglishHyponym
ammonia clock 1
noun
an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule
caesium clock 1
noun
an atomic clock based on the energy difference between two states of the caesium nucleus in a magnetic field
