The Femto reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Femto

Femto is a prefix (see all prefixes) to a unit and means that it is 10^-15 times this unit, or, one quindecillionth (European) or one quadrillionth (American).

Examples are one femtosecond or one femtometer. The origin of this prefix is the Danish word femten, which means fifteen.

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