femto- [FEM toh] (Danish and Norwegian: fifteen; a decimal prefix used in the international metric system for measurements).It is used in the metric [decimal] system as quadrillionth [U.S.] and thousand-billionth part [U.K.], 10-15 [0.000 000 000 000 001]. The metric symbol for femto- is f. femtoampere:
femtogram:
femtojoule:
femtoliter:
femtometer:
femtomole:
femtosecond:
femtovolt:
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