blocker
Americannoun
-
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.
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
Etymology
Origin of blocker
Middle English word dating back to 1200–50; see origin at block, -er 1
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Medics whisked him to safety, gave him a pain blocker, and placed him in a bed with a recessed, plush mat that molded to his body.
From Slate ● Sep. 22, 2026
He was a defensive end as a freshman before Rosenblum convinced him to become a blocker.
From Los Angeles Times ● Aug. 15, 2026
Dame Hilary Cass says puberty blocker trial is "essential"
From BBC ● Jun. 22, 2026
DNS leak protection is built in, and there’s also CleanWeb, Surfshark’s ad and malware blocker that works system-wide.
From Salon ● Jun. 17, 2026
He could hit like a locomotive and was a devastating blocker.
From "October Sky" by Homer Hickam
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
