1. A white powder derived from the cacao bean, found in chocolate products and which has effects similar to caffeine: Theobromine has been used as a diuretic in treating cardiovascular disorders and as a myocardial stimulant.

Dogs consuming excessive amounts of cocoa sometimes suffer toxic effects from the theobromine, such as vomiting, diarrhea, muscle spasms, and coma."
2. Etymology: from modern Latin Theobroma, genus name of the cacao tree, literally 'food of the gods'."