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Noun blocker has 2 senses
  1. blocker - a football player whose responsibility is to block players attempting to stop an offensive play
    --1 is a kind of     football player, footballer
    Derived form: verb block12
  2. blocker, blocking agent - a class of drugs that inhibit (block) some biological process
    --2 is a kind of medicine, medication, medicament, medicinal drug; agent
    --2 has particulars:
     alpha blocker, alpha-blocker, alpha-adrenergic blocker, alpha-adrenergic blocking agent; beta blocker, beta-adrenergic blocker, beta-adrenergic blocking agent; labetalol, labetalol hydrochloride, Trandate, Normodyne; neuromuscular blocking agent
    Derived form: verb block6
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