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blocker

[blok-er] /ˈblɒk ər/
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.
Origin of blocker
1200-1250
1200-50; Middle English; see block, -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for blocker

blocker

/ˈblɒkə/
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
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
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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15
18
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