femto-

combining form

Definition of femto-

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

Origin and Etymology of femto-

International Scientific Vocabulary, from Danish 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

to help become familiar with something

Get Word of the Day daily email!