ammonia clock

1. 1.

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

   Broaderatomic clock

Questions about ammonia clock

What does ammonia clock mean?

ammonia clock means "an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule".

Is ammonia clock a common word?

ammonia clock is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.