Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

femto-

combining form

Definition of femto-

  1. :  one quadrillionth (10−15) part of <femtosecond>



Origin and Etymology of femto-

International Scientific Vocabulary, from Dan or Norwegian femten fifteen, from Old Norse fimmtān; akin to Old English fīftēne fifteen


Learn More about femto-


Seen and Heard

What made you want to look up femto-? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

different from the usual or normal

Get Word of the Day daily email!