ゼプトじ字FuriganaAudioMeanings1prefixzepto-; 10^-21SI prefix meaning 10^-21. Used in scientific and technical contexts.ゼプト秒びょうは10のマイナス21乗じょう秒びょうです。Break this sentence down in the analyzerA zeptosecond is 10^-21 seconds.See all 2 example sentences ›