Yocto-

//ˈjɑk.toʊ// prefix

prefix ·Rare ·Advanced level

Definitions

Prefix
  1. 1
    In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻²⁴ short scale septillionth or long scale quadrillionth). morpheme

Antonyms

All antonyms
yotta

Etymology

Ancient Greek ὀκτώ (oktṓ, “eight”), for the eighth order of 10⁻³. The letter y was added, as the second term in a series running backwards through the alphabet.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.