atto-

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

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Origin of atto-

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

Words nearby atto-

attitudinize, Attius, Attleboro, Attlee, attn., atto-, attolaser, attophysics, attorn, attorney, attorney-at-law

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use atto- in a sentence

This was posted in the usual places on September 3d, the day fixed for the atto di fede in which Molinos was to appear.
A History of the Inquisition of Spain; vol. 4|Henry Charles Lea
The day after the atto di fede his disciples performed their abjuration.
A History of the Inquisition of Spain; vol. 4|Henry Charles Lea
Fel yr oedd Pedr yn eistedd ar faen Mynor, Crist a ddaeth atto, ac efe yn unig.
Welsh Folk-Lore|Elias Owen
The imperial council appointed as his successor one Godfrey; the pope had nominated Atto.
History of the Intellectual Development of Europe, Volume II (of 2)|John William Draper

Atto, however, was a puritan, who endeavored to resist the general demoralization of the age.
A History of The Inquisition of The Middle Ages; volume III|Henry Charles Lea

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012