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-.

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Word of the day grotesquerie
Pronunciation: grəʊˈtɛskəri
noun
grotesque quality or grotesque things collectively