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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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music