Definition of zepto- in English:

zepto-

Pronunciation: /ˈzɛptəʊ/

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 hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up