Standard Lemma guide

theine

noun · 2 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

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  • /ˈθiː.iːn/
  • /ˈθeɪ.iːn/
  • /ˈteɪ.iːn/

1

noun

Meaning 1

Caffeine when present in tea.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: chemistry, natural-sciences, organic-chemistry, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

Obsolete form of thane.

Definition source: English Wiktionary via Wiktextract

Usage: alt-of, obsolete

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From French théine.

Across languages

Translations

15 source translations are retained for this English entry.

  • Czech: tein — Caffeine in tea
  • Finnish: teiini — Caffeine in tea
  • French: théine — Caffeine in tea
  • German: Tein — Caffeine in tea
  • Greek: τεΐνη (teḯni) — Caffeine in tea
  • Hungarian: tein — Caffeine in tea
  • Italian: teina — Caffeine in tea
  • Polish: teina — Caffeine in tea
  • Portuguese: teína — Caffeine in tea
  • Romanian: teină — Caffeine in tea
  • Russian: теи́н (teín) — Caffeine in tea
  • Sicilian: tiina — Caffeine in tea
  • Spanish: teína — Caffeine in tea
  • Swedish: tein — Caffeine in tea
  • Turkish: tein — Caffeine in tea