| femtochemistry | (noun) the branch of chemistry that studies elementary (often very fast) chemical reactions as they occur; the experimental methods are often based on the use of femtosecond laser pulses | - |
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| femtometer | (noun) a metric unit of length equal to one quadrillionth of a meter | Synonyms: femtometre, fermi |
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| femtometre | (noun) a metric unit of length equal to one quadrillionth of a meter | Synonyms: femtometer, fermi |
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| femtosecond | (noun) one quadrillionth (10^-15) of a second; one thousandth of a picosecond | - |
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| femtovolt | (noun) a unit of potential equal to one quadrillionth of a volt (or one thousandth of a picovolt) | - |
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