FEMTOSECOND
femtosecond
(noun) one quadrillionth (10^-15) of a second; one thousandth of a picosecond
Source: WordNet® 3.1
Etymology
Noun
femtosecond (plural femtoseconds)
A unit of time equal to 0.000 000 000 000 001 seconds (i.e. 1x10-15 seconds) and with symbol fs.
Source: Wiktionary
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