beta-adrenergic blocking agent
be·taad·re·nergicblockingagent
noun
1.
any of various drugs used in treating hypertension or arrhythmia; decreases force and rate of heart contractions by blocking beta-adrenergic receptors of the autonomic nervous system
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.