blocker
//ˈblɒkər//
Noun
blockerSingular
blockersPlural
1
A person or thing that blocks or obstructs something.
The tall building is a blocker of sunlight for the houses behind it.
2
A substance or device that prevents or inhibits a specific physiological or chemical action.
The doctor prescribed a beta blocker to help control his high blood pressure.
3
In sports, a player whose role is to block opponents.
The team's blocker stopped the opponent's attack at the net.