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alpha blocker

or al·pha-block·er

See more synonyms for alpha blocker on Thesaurus.com
noun Pharmacology.
  1. any of various substances that interfere with the action of the alpha receptors.
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Compare beta blocker.
Related formsal·pha-block·ing, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018