Real Dictionary

theobromine in American English
a bitter, crystalline alkaloid, C7H8N4O2, extracted from the leaves and seeds of the cacao plant, used in medicine as a diuretic and nerve stimulant: it is closely related to caffeine and is also found in cola nuts and tea
noun: a white, crystalline, water-insoluble, poisonous powder, C7H8N4O2, an isomer of theophylline and lower homologue of caffeine, occurring in tea and obtained from the cacao bean: used chiefly as a diuretic, myocardial stimulant, and vasodilator

theobromine in British English
noun: a white crystalline slightly water-soluble alkaloid that occurs in many plants, such as tea and cacao: formerly used to treat asthma. Formula: C7H8N4 O2