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be'ta block"er

any of various substances that interfere with the action of the beta receptors: used primarily to reduce the heart rate or force in the prevention, management, or treatment of angina, hypertension, or arrythmias. Also,be'ta-block"er.Cf. alpha blocker.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

beta-adrenergicbeta brass
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