femto

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.

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

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Collins
World English Dictionary
femto-
 
prefix
f denoting 10--15: femtometer
 
[from Danish or Norwegian femten fifteen]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Femto is always a great word to know.
So is flibbertigibbet. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a chattering or flighty, light-headed person.
American Heritage
Medical Dictionary

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.
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