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atto-

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atto-

 
Use atto- in a Sentence
a combining form that enters into compounds denoting a unit one-quintillionth (10−18) the size of the unit named by the stem.
Origin:
< Dan or Norw att(en) eighteen + -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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atto-  
pref.  One quintillionth (10-18): attotesla.

[From Danish or Norwegian atten, eighteen, from Old Norse āttjān; see oktō(u) 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

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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Computing Dictionary

atto-
prefix

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