Blocker

A blocker is someone or something that blocks.

Blocker can also refer to:

Surname

• Blocker (surname)

Medicine

• Receptor antagonists, such as an alpha blockers or beta blockers, that block molecular attachment
  • Alpha blockers, a class of vasoactive drugs
  • Angiotensin II receptor antagonists, a class of vasoactive drugs
  • Beta blockers, a class of vasoactive drugs
• Channel blockers, blockers that block ion channels

Optics

• The inverse of a filter (optics). Instead of blocking everything except target color(s) like a filter does, a blocker lets everything else pass and blocks only the color(s) specified

Corporations

• Blocker corporation

Sports

• Blocker (ice hockey)
• The nickname of Steve Roach, Australian rugby league footballer
• Blocker (cricket), slang for a defensive-minded batsman in cricket
• Blocker, is a position in roller derby

Fiction

• Blocker (G.I. Joe), a fictional character in the G.I. Joe universe