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.
Definition of limp. 1  1a : lacking firm texture, substance, or structure limp curtains her hair hung limp about her shouldersb : not stiff or rigid a book in a limp binding. 2  2a : weary, exhausted limp with fatigueb : lacking in strength, vigor, or firmness : spiritless.