atto-
a combining form that enters into compounds denoting a unit one-quintillionth (10−18) the size of the unit named by the stem.
Words nearby atto-
attius, attleboro, attlee, attn, attn., atto-, attolaser, attophysics, attorn, attorney, attorney general
Origin of atto-
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for atto-
atto-
prefix
denoting 10 –18attotesla Symbol: a
Word Origin for atto-
from Norwegian, Danish atten eighteen
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Medical definitions for atto-
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.