Definition of atto- in English:

atto-

Syllabification: atto-

combining form

Mathematics
(Used in units of measurement) denoting a factor of 10-18: attowatt

Origin

from Danish or Norwegian atten 'eighteen'.

Definition of atto- in:

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Word of the day flagitious
Pronunciation: fləˈjiSHəs
adjective
(of a person or their actions) criminal; villainous