theine noun.
['Ɵi:i:n, 'Ɵi:ɪn] M19.[from mod. Latin Thea former genus name of the tea plant from Dutch thee, formed as TEA noun: see -INE5.]Chemistry. Caffeine;
esp. that obtained from tea (orig. thought to be a different substance).
[TahlilGaran] English Dictionary ▲