femtosecond

noun

Meaning

An SI unit of time equal to 10⁻¹⁵ seconds. Symbol: fs

Etymology / origin

Etymology tree Proto-Indo-European *pénkʷe Proto-Germanic *fimf Proto-Indo-European *déḱm̥ Proto-Germanic *tehun Proto-Germanic *fimftehun Old Norse fimmtánder. Danish femtender. English femto- English second English femtosecond From femto- + second.

Sources

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