Definition of zepto- in English:

zepto-

Syllabification: zepto-

combining form

(Used in units of measurement) denoting a factor of 10−21: zeptosecond

Origin

adapted from septi-, on the pattern of combining forms such as peta- and exa-.

Definition of zepto- in:

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Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true