blocker(redirected from H2-receptor blocker)
Also found in: Dictionary, Thesaurus.
something that blocks or obstructs a passage or activity; see also antagonist and blocking agent.
α-blocker alpha-adrenergic blocking agent.
β-blocker (beta-blocker) beta-adrenergic blocking agent.
calcium channel blocker calcium channel blocking agent.
potassium channel blocker potassium channel blocking agent.
sodium channel blocker sodium channel blocking agent.
An instrument used to obstruct a passage.
blockerA popular term for anything which physically (e.g., a bed blocker, see there) or pharmacologically (e.g., a beta-blocker) impedes a process or activity.
1. An instrument used to obstruct a passage.
2. See: blocking agent