definitions

blocker

[ blok-er ]
/ ˈblɒk ər /
|

noun

a person or thing that blocks.
Football. a player whose assignment or special skill is blocking.
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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Nearby words

blockbust, blockbuster, blockbusting, blocked, blocked shoe, blocker, blockflöte, blockhead, blockhouse, blockie, blocking

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. 2019

Examples from the Web for blocker

British Dictionary definitions for blocker

blocker

/ (ˈblɒkə) /

noun

a person or thing that acts as a block
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