What is the meaning of ammonia clock?

noun

  • An atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule. .
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). ammonia clock. Retrieved September 21, 2026, from http://smartdefine.org/ammonia_clock/definitions/1201183
ChicagoWordNet. 2010. "ammonia clock" http://smartdefine.org/ammonia_clock/definitions/1201183 (accessed September 21, 2026).
HarvardWordNet 2010, ammonia clock, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/ammonia_clock/definitions/1201183>.
MLAWordNet. "ammonia clock" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/ammonia_clock/definitions/1201183>