Definition of femtosecond

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femtosecond is a valid Scrabble US word with a point value of 19
femtosecond is a valid Scrabble UK word with a point value of 19
femtosecond is a valid Words with friends word with a point value of 22

Definition of femtosecond

one quadrillionth (10^-15) of a second; one thousandth of a picosecond (noun)

See definition of femtosecond in Merriam Webster