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atto

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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:
< Dan or Norw att(en) eighteen + -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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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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