femto- Hear it!

femto- definition

femto- (fem′tō)

one quadrillionth part of; the factor 10 femtosecond

Etymology: < Dan femten, fifteen < ODan femtan < fem, five + -tjan, -teen

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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