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.

---

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

---

Etymology

Origin of blocker

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

Example Sentences

Miller is durable and a particularly adept pass blocker.

From Los Angeles Times

FastestVPN is a holistic security solution that includes a firewall, ad blocker, and more — plus, it works across all types of operating systems, so you don’t have to worry about incomplete coverage.

From Salon

And as a bonus, NordVPN’s ad blocker and malware detector give you virus protection in addition to encrypted online privacy.

From Salon

In this example, the Chelsea players have roles as 'blockers' - a tactic that is increasingly common from corners, with the aim of nullifying the strongest aerial threats by impeding their movement.

From BBC

They include private web browsers, encrypted messaging apps, password managers, tracker blockers and Virtual Private Networks.

From BBC