Standard Lemma guide

yocto-

prefix · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • yŏk′tō-
  • Received-Pronunciation: /ˈjɒk.təʊ̯-/
  • UK: Recorded audio is listed in the source snapshot.
  • General-American: /ˈjɑk.toʊ̯-/

1

prefix

Meaning 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).

Definition source: English Wiktionary via Wiktextract

Usage: morpheme

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: yotta-

History

Etymology

From 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.

Across languages

Translations

16 source translations are retained for this English entry.

  • Bulgarian: йокто- (jokto-) — 10−24
  • Chinese Mandarin: 幺科托 (yāokētuō) — 10−24
  • Dutch: yocto- — 10−24
  • Finnish: jokto- — 10−24
  • French: yocto- — 10−24
  • Galician: yocto- — 10−24
  • German: yokto- — 10−24
  • Icelandic: joktó- — 10−24
  • Indonesian: yokto- — 10−24
  • Japanese: ヨクト- (yokuto-) — 10−24
  • Malay: yokto- — 10−24
  • Russian: йокто- (jokto-) — 10−24
  • Thai: ยอกโต- (yɔ̂ɔk-too-) — 10−24
  • Ukrainian: йокто- (jokto-) — 10−24
  • Vietnamese: yóc-tô — 10−24
  • Vietnamese: yoc-tô — 10−24