ni·tro·glyc·er·in also ni·tro·glyc·er·ine 
(nī′trō-glĭsər-ĭn, -trə-)
(nī′trō-glĭsər-ĭn, -trə-)n.
A thick, pale yellow liquid, C3H5N3O9, that is explosive on concussion or exposure to sudden heat. It is used in the production of dynamite and blasting gelatin and as a vasodilator in medicine.