zepto-
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zepto-
- /ˈzɛp.təʊ̯-/ UK
- /ˈzɛp.toʊ̯-/ US
Where it comes from
From Ancient Greek ἑπτᾰ́ (heptắ, “seven”), for the seventh order of 10⁻³. The final o conforms to the finals vowel of the SI series from micro- downwards; the letter z was added, as a start in a series of terms running backwards through the alphabet.
prefix
-
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻²¹ (short scale sextillionth or long scale trilliardth).
Opposite: zetta-
Translations
Talk about this word "zepto-." Wiktionary, via Micwyn, micwyn.com/word/zepto-. Accessed 6 Nov. 2026. zepto-. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/zepto- "zepto-." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/zepto-.Cite this
@misc{zepto_2026,
title = {zepto-},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/zepto-},
urldate = {2026-11-06}
}
