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blocker

[blok-er]
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noun
  1. a person or thing that blocks.
  2. Football. a player whose assignment or special skill is blocking.
  3. Biochemistry. a substance that inhibits the physiological action of another substance, as the beta blocker propranolol that interferes with neurotransmitters in the sympathetic nervous system.
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Origin of blocker

Middle English word dating back to 1200–50; see origin at block, -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for blocker

Historical Examples

  • Blocker's foreman, disdaining an invitation to dismount, saluted his host.

    Wells Brothers

    Andy Adams

  • Mr. Blocker's Bat, which he carried through a whole season without scoring once off it.

British Dictionary definitions for blocker

blocker

noun
  1. a person or thing that acts as a block
  2. physiol an agent that blocks a physiological function, such as the transport of an ion across an ion channel
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for blocker

n.

c.1400 of a tool, c.1600 of a person, agent noun from block (v.). U.S. football sense from 1914.

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Online Etymology Dictionary, © 2010 Douglas Harper