# theine

> English word · Noun · IPA /ˈθiː.iːn/

## Definitions
1. Caffeine when present in tea.

## Etymology
From French théine.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/theine