ammonia clock - definition of ammonia clock - synonyms, pronunciation, spelling from Free Dictionary

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Wordnet 3.0

NOUN (1)

1. an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule;


WordNet (r) 3.0 (2006):

ammonia clock
    n 1: an atomic clock based on vibrational frequency of the
         nitrogen atom in the ammonia molecule