ATTO-


Meaning of ATTO- in English

/ ˈætəʊ; NAmE ˈætoʊ/ combining form

(in units of measurement) a factor of 10 -18 :

200 attowatts

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WORD ORIGIN

from Danish or Norwegian atten eighteen.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.