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femto-

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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:
< Dan, Norw femt(en) fifteen + -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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femto-  
pref.  One quadrillionth (10-15): femtovolt.

[From Danish and Norwegian femten, fifteen, from Old Norse fimmtān; see penkwe in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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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Computing Dictionary

femto-
prefix

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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