Word.ws English Dictionary

theine

/ˈθiː.iːn/

theine noun: caffeine when present in tea. Also the obsolete form of thane.

Noun

theine (uncountable)

  1. Caffeine when present in tea.
    • Caffeine is called guaranine when found in guarana, mateine when found in mate and theine when found in tea. There is far more caffeine in coffees than in teas.2010, Crispian Scully, Medical Problems in Dentistry E-Book, Elsevier Health Sciences, →ISBN, page 693

Also used as

theine is also the obsolete form of thane.

Forms of theine

pluraltheines

Origin of theine

From French théine.

Questions about theine

What does theine mean?
Theine means caffeine when present in tea.
What part of speech is theine?
Theine is a noun.
How do you pronounce theine?
Theine is pronounced /ˈθiː.iːn/.
What is the plural of theine?
The plural of theine is theines.

Words near theine in the dictionary

  1. theileriosis
  2. Theilers
  3. theilovirus
  4. theim
  5. thein
  6. theine
  7. theines
  8. theinism
  9. theins
  10. theion
  11. their

Source and license

Adapted from Wiktionary: theine (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:

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