WordNet (r) 3.0 (2006):

calcium-channel blocker
    n 1: any of a class of drugs that block the flow of the
         electrolyte calcium (either in nerve cell conduction or
         smooth muscle contraction of the heart); has been used in
         the treatment of angina or arrhythmia or hypertension or
         migraine [syn: calcium blocker, calcium-channel
         blocker]