Word.ws English Dictionary

xenno-

xenno- prefix: synonym of ronto- (used before an official prefix existed). Symbol: x.

Prefix

xenno-

  1. (informal) Synonym of ronto- (used before an official prefix existed). Symbol: x
    • The SI prefixes above are not the only extreme ones. Others such as xenno (x) (10⁻²⁷) and xenna (X) (10²⁷), or vendeko (v) (10⁻³³) and vendeka (V) (10³³) exist, and can help simplify the expression of extreme numbers.1994, IPC Magazines, New Scientist, volume 144, page 81
    • 'Now we're talking xennobiology!' [...] a complex organism based on similar processes to the primitive ones they'd seen probably would be about a xennometre in size.2002, Greg Egan, Schild's Ladder, Gollancz, published 2008, page 184
    Synonyms:
    ronto-

Synonyms of xenno-

Antonyms

Origin of xenno-

From Ancient Greek ἐννέα (ennéa, “nine”), for the ninth order of 10³; with the letter x added for the third term in a series running backwards through the alphabet (after zepto- and yocto-). The final o conforms to the final vowels of the SI series from micro- downwards.

Questions about xenno-

What does xenno- mean?
Xenno- means synonym of ronto- (used before an official prefix existed). Symbol: x.
What part of speech is xenno-?
Xenno- is a prefix.

Words near xenno- in the dictionary

  1. Xenix
  2. xenization
  3. xenna-
  4. xennial
  5. xennials
  6. xenno-
  7. xeno-
  8. xeno-free
  9. xenoamicin
  10. xenoamicins
  11. xenoandrogen

Source and license

Adapted from Wiktionary: xenno- (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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