Etymology Explorer › English

Where does “femto-” come from?

femto- (English) comes from Danish femten, from Old Norse fimmtán, from Proto-Germanic fimftehun, from Proto-Germanic tehun, from Proto-Indo-European déḱm̥t — ten.

femto- (English): API; In the International System of Units and...

Definitions

  1. API; In the International System of Units and...

Ancestry of “femto-”, step by step

StepLanguageWordMeaning
1Danishfemtenfifteen
2Old Norsefimmtánfifteen
3Proto-Germanicfimftehunfifteen
4Proto-Germanictehunten
5Proto-Indo-Europeandéḱm̥tten

Words derived from “femto-”

  • femtosecond
  • femtomole
  • femtomolar
  • femtoliter
  • femtogram
  • femtometer
  • subfemtosecond
  • femtometre
  • femtoplankton
  • femtofarad
  • femtolitre
  • femtojoule
  • femtoampere
  • femtokatal
  • femtobel
  • femtocaching
  • femtoengineering
  • subfemtomolar
  • femtoscopic
  • femtomagnetism
  • femtocell
  • femtoscopy
  • femtolensing
  • femtoelectronvolt
Every word from Proto-Indo-European déḱm̥t →