femto-


a combining form used in the names of units of measurement which are 10−15 (one quadrillionth) smaller than the unit denoted by the base word.

Nearby words

  1. femoral nerve,
  2. femoral sheath,
  3. femoral triangle,
  4. femoral vein,
  5. femorotibial,
  6. femtometer,
  7. femur,
  8. fen,
  9. fen-phen,
  10. fenagle

Origin of femto-

< Danish, Norwegian femt(en) fifteen + -o-

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for femto-

femto-

prefix

denoting 10 –15femtometer Symbol: f

Word Origin for femto-

from Danish or Norwegian femten fifteen

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for femto-

femto-

pref.

One quadrillionth (10-15):femtovolt.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.