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

Her own experience of taking puberty blockers has left her "extremely angry", she added.

From BBC

On the downside, the CleanWeb ad blocker, while useful, isn’t as robust as dedicated security solutions.

From Salon

The Animal and Plant Health Agency says that will make it easier to identify underage animals and will put a "blocker" on the trade because older puppies are simply less cute.

From BBC

These networks are limited to specific use cases where data sovereignty and compliance aren’t blockers.

From MarketWatch

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