Propranolol Definition
 prō-prănə-lôl, -lōl, -lŏl 
    noun
  
 A drug, C16H21NO2, that inhibits the activity of epinephrine and similar substances, used in controlling irregular heartbeats and in treating angina pectoris.
 Webster's New World 
A non-selective beta blocker mainly used in the treatment of hypertension.
Wiktionary 
Origin of Propranolol
pro(pyl) pr(op)anol (propan(e)) (–ol) –ol
From American Heritage Dictionary of the English Language, 5th Edition
-  
(iso)pro(pylaminonaphthyloxy-)pr(op)anol + -ol
From Webster's New World College Dictionary, 5th Edition
 
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