Freebase(0.00 / 0 votes)Rate this definition: Diltiazem. Diltiazem is a nondihydropyridine member of the class of drugs known as calcium channel blockers, used in the treatment of hypertension, angina pectoris, and some types of arrhythmia. It is also an effective preventive medication for migraine. It is a class 3 antianginal drug, and a class IV antiarrhythmic.
Rigid definition, stiff or unyielding; not pliant or flexible; hard: a rigid strip of metal. See more.
forÂ·malÂ·ism. n. 1. Rigorous or excessive adherence to recognized forms, as in religion or art. 2. An instance of rigorous or excessive adherence to recognized forms. 3. A method of aesthetic analysis that emphasizes structural elements and artistic techniques rather than content, especially in literary works. forâ²malÂ·ist adj. & n. forâ²malÂ·isâ²tic adj.