atto- Hear it!

atto- definition

atto- (at′ō)

one quintillionth part of; the factor 10 attosecond

Etymology: < Dan atten, eighteen < ODan attan < atta, eight + -tjan; akin to OE -tyne, -teen

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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