atto-

atto-

a combining form that enters into compounds denoting a unit one-quintillionth (10 −18 ) the size of the unit named by the stem.

Origin:
< Danish or Norwegian att(en) eighteen + -o-

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Collins
World English Dictionary
atto-
 
prefix
a denoting 10--18: attotesla
 
[from Norwegian, Danish atten eighteen]

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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American Heritage
Medical Dictionary

atto- pref.
One quintillionth (10-18): attometer.

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

atto- definition


prefix

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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