atto-


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atto-

 
word element [Danish], eighteen; used in naming units of measurement to designate an amount one quintillionth (10−18) the size of the unit to which it is joined; symbol a.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

atto- (a),

(at'ō),
Prefix used in the SI and metric system to signify one quintillionth (10-18).
[Danish atten, eighteen]
Farlex Partner Medical Dictionary © Farlex 2012

atto-

Prefix used in the SI and in the metric system to signify one quintillionth (10-18).
[Danish atten, eighteen]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012