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.
Webster Dictionary (0.00 / 0 votes) Rate this definition: Stiff. not easily bent; not flexible or pliant; not limber or flaccid; rigid; firm; as, stiff wood, paper, joints. Stiff. not liquid or fluid; thick and tenacious; inspissated; neither soft nor hard; as, the paste is stiff. Stiff. firm; strong; violent; difficult to oppose; as, a stiff gale or breeze