Word.ws English Dictionary

thio-

/θʌɪ.ə(ʊ)//θaɪ.oʊ/

thio- prefix: containing sulfur, especially a compound in which oxygen has been replaced by this element.

Prefix

thio-

  1. containing sulfur, especially a compound in which oxygen has been replaced by this element
    • Chalcogen analogues of monocarboxylic acids with retained names may also be named by placing the prefix ‘thio’, ‘seleno’, or ‘telluro’ in front of the name of the acid.2013, Henri A. Favre and Warren H. Powell, eds., Nomenclature of Organic Chemistry, 765

Forms of thio-

alternative before-vowelthi-

Origin of thio-

Derived from Ancient Greek θεῖον (theîon, “sulfur”).

Questions about thio-

What does thio- mean?
Thio- means containing sulfur, especially a compound in which oxygen has been replaced by this element.
What part of speech is thio-?
Thio- is a prefix.
How do you pronounce thio-?
Thio- is pronounced /θʌɪ.ə(ʊ)/ (UK).

Words near thio- in the dictionary

  1. thinstripe hermit crab
  2. thinstripe hermit crabs
  3. thinstripe hermits
  4. Thinus
  5. thinwire
  6. thio-
  7. thioacetal
  8. thioacetals
  9. thioacetamide
  10. thioacetamides
  11. thioacetate

Source and license

Adapted from Wiktionary: thio- (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.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Tesco250-thio-.wav, LL-Q1860 (eng)-Flame, not lame-thio-.wav.

Cite this entry: “thio-.” Word.ws, https://word.ws/thio-. Based on Wiktionary, CC BY-SA 4.0.