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Meaning of blocker

block•er

Pronunciation: (blok'ur), [key]
— n.
  1. a person or thing that blocks.
  2. a player whose assignment or special skill is blocking.
  3. a substance that inhibits the physiological action of another substance, as the beta blocker propranolol that interferes with neurotransmitters in the sympathetic nervous system.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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