blocker

American  

[blok-er] / ˈblɒk ər /

noun

1. a person or thing that blocks.

2. Football.  a player whose assignment or special skill is blocking. block.

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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blocker British  

/ 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

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Etymology

Origin of blocker

Middle English word dating back to 1200–50; block, -er ¹

Example Sentences

They will all have reached puberty, but will be younger than 16 - and will have to meet strict criteria, undergo intensive medical and psychological screening before they are allowed to start taking puberty blockers.

From BBC

"The government must not veer down the path of viewing nature as an inconvenience or blocker to housebuilding," the report said.

From BBC

He returned for a Thursday night victory over Minnesota, and his presence was felt both as a protector and a run blocker.

From Los Angeles Times

Terms like “J. Crew blockers” and “anti-PetSmart,” which prevent issuers from shifting valuable assets beyond creditors’ reach, have become more prevalent in recent years.

From The Wall Street Journal

Khalil Mack, wearing a brace on his injured elbow, was a nightmare for Vikings blockers and spent much of his time in the Minnesota backfield.

From Los Angeles Times