THEINE Meaning of THEINE in English [ 'θi:i:n , 'θi:ɪn ]■ noun caffeine, especially in tea.OriginC19: from mod. L. Thea (former genus name of the tea plant) + -ine 4 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004