combining form \ˈa-(ˌ)tō\

Definition of ATTO-

:  one quintillionth (10−18) part of <attogram>

Origin of ATTO-

International Scientific Vocabulary, from Dan or Norwegian atten eighteen, from Old Norse āttjān; akin to Old English eahtatīene eighteen


Next Word in the Dictionary: attorn
Previous Word in the Dictionary: attn
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