a yellow crystalline substance, C11H8O3, produced by the human tubercle bacillus, Mycobacterium tuberculosis, having antibiotic and blood-clotting properties.
Main Entry: phthi·o·col Pronunciation: 'thI-&-"kol, -"kOl Function: noun : a yellow crystalline quinoneC11H8O3 with vitamin K activity that is isolated from the human tubercle bacillus and also made synthetically