from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A blocking agent, one of a class of drugs used to treat hypertension and control the rate at which the heart beats.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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
From action of drug which blocks beta-adrenergic receptors. (Wiktionary)