Theine

//ˈθiː.iːn// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Caffeine when present in tea. uncountable

    "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."

  2. 2
    Obsolete form of thane. alt-of, obsolete
  3. 3
    caffeine when present in tea. wordnet

Example

More examples

"There is theine in tea, and caffeine in coffee."

Etymology

From French théine.

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