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ammonia clock

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

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  • ammonia alum
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  • ammonia
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  • ammodytidae
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  • ammobium
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  • ammeter
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  • ammonia water
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  • ammoniac
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  • ammoniacal
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  • ammoniate
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  • ammoniated
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  • ammonification
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  • joylessness
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    Idiom of the Day

    ground floor
    the first or best chance (especially in a business)
    The video store was a good investment and I was happy to get in on the ground floor.



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