/thee'euh broh"meen, -min/ , n. Pharm.
a white, crystalline, water-insoluble, poisonous powder, C 7 H 8 N 4 O 2 , 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.
[ 1835-45; Theobrom ( a ) genus of trees typified by cacao ( theo- THEO- + brôma food) + -INE 2 ]