blocker

5 definitions • 9 examples

something or someone that prevents something from happening or succeeding:

I've installed an ad blocker so I don't get all those annoying adverts popping up when I'm browsing.

The school needs to identify staff who are blockers of progress.

something that prevents something from passing through it to reach a place:

Titanium and zinc are effective blockers of ultraviolet radiation.

a substance or medicine that stops a particular process from happening in the body:

Calcium channel blockers help control an irregular heart beat.

To test whether opiates were responsible for the effects, researchers gave subjects an opiate receptor blocker.

in American football, a player who stops players from the other team from reaching the player carrying the ball:

His size and speed made him both an excellent blocker and a useful offensive player.

He was so good at sacking the quarterback that teams sometimes used as many as three blockers to keep him away.

in ice hockey (= a game played on ice), a large, thick piece of material worn on the hand and arm of a goaltender (= the player who stands in the team's goal to try to stop the other team from scoring):

Right-handed goaltenders will wear the blocker on the right hand.

The puck bounced clear off the goalie's blocker.