beta blocker

noun Pharmacology.

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.

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Also, be·ta-block·er.

Compare alpha blocker.

Origin:
1975–80

Related forms

be·ta-block·ing, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Beta blocker is always a great word to know.

So is flibbertigibbet. Does it mean:

a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

a chattering or flighty, light-headed person.

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WordNet

beta blocker
noun
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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