zepto-EnglishOxford Dictionary of Englishzepto- /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-.
EnglishOxford Dictionary of EnglishEnglishOxford Dictionary of English
