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.
â¢ Meaning is: âmiddle scaleâ or âin-betweenâ scale. â¢ Synoptic â Mesoscale â Convective scale. â¢ Division of scales is not rigid â there is a continuum. so that any phenomena is affected by other scales.