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Definition of Femto-
1. Prefix. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10?15. Symbol: f. ¹
¹ Source: wiktionary.com
Medical Definition of Femto-
1. SI and metric systems to signify one-quadrillionth (10-15). Origin: Danish and Norwegian femten, fifteen (05 Mar 2000)