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The Adobe Flash Player is required in order to view this content. You can get it here: beta-blockerMain Entry: be·ta–block·er Pronunciation: \-ˌblä-kər\ Function: noun Date: 1968 : any of a class of drugs (as propranolol) that decrease the rate and force of heart contractions and lower high blood pressure by blocking the activity of beta-receptors — be·ta–block·ing \-kiŋ\ adjective 
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