blocker


Also found in: Dictionary, Thesaurus, Legal, Financial, Idioms, Encyclopedia, Wikipedia.
Related to blocker: Ad blocker

blocker

 [blok´er]
something that blocks or obstructs a passage or activity; see also antagonist and 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.

block·er

(blok'er),
An instrument used to obstruct a passage.

blocker

/block·er/ (blok´er) something that blocks or obstructs passage, activity, etc.
α-blocker  alpha-adrenergic blocking agent; see adrenergic blocking agent.
β-blocker  beta-adrenergic blocking agent; see adrenergic blocking agent.
calcium channel blocker  calcium channel blocking agent.
potassium channel blocker  potassium channel blocking agent.
sodium channel blocker  sodium channel blocking agent.

blocker

blocker

A 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.

block·er

(blok'ĕr)
1. An instrument used to obstruct a passage.

blocker

something that blocks or obstructs passage, activity, etc.

α-blocker, alpha-blocker
a drug that induces adrenergic blockade at α-adrenergic receptors.
β-blocker, beta-blocker
a drug that induces adrenergic blockade at either β1- or β2-adrenergic receptors, or both (see also beta-blocker).
calcium channel blocker
a drug that selectively inhibits the influx of calcium ions through a specific ion channel of cardiac muscle and smooth muscle cells (see also calcium channel blocker).
H2-receptor blocker
a drug, such as cimetidine that inhibits the secretion of gastric acid stimulated by histamine, pentagastrin, food and insulin, and also basal secretion; used in the treatment of peptic ulcer.
References in periodicals archive ?
Blocker is hoping to qualify for the Rabbit Kekai World Surfing Championships in Costa Rica in 2003.
If you're taking beta blockers to help control your high blood pressure and prevent a heart attack or stroke, a recent study suggests you may be better off with a different medication.
Even when the investigators broke down their analyses by duration of use of beta blockers, specific types of beta blockers, active ingredients (metoprolol, bisoprolol, carvedilol, and atenolol), and sites within the colon or rectum where colorectal cancer developed, there was no link.
In some patients, use of the nonselective alpha blockers may dramatically reduce blood pressure (hypotension), especially after starting treatment, and increase the risk of fainting (syncope) and falls.
This kind of step will also enable the blocker to pick up a blitzing linebacker or stunting lineman entering the blocker's inside gap, as well as put him on a path to block a linebacker inside of them.
Side effects tend to be more common in older adults and can be serious--there is evidence beta blockers may raise the risk of stroke among elderly users by 19 percent.
When the attacker moves quickly he or she will make it extremely difficult for one blocker to cover both hitters.
Senior outside hitter Jennifer Adams, the Spirits' leader in kills and assists last season, will return for her senior year and Dani Gaeta, who played middle blocker a year ago, will slide over to outside hitter for her senior year.
The type of beta blocker we found to be effective against melanoma -- pan beta blockers -- was actually the least prescribed," Schell said.
Agriculture Commissioner Sid Miller is getting a primary challenge from Trey Blocker, the longtime lobbyist, ethics adviser and attorney from Austin.
TEHRAN (FNA)- Computer scientist Arvind Narayanan, along with his colleagues from Princeton and Stanford have developed a new proof-of-concept ad blocker that spots ads more like a human.
Retale, a location-based mobile platform that helps shoppers save on purchases from retailers and brands, announced the results of a commissioned study examining ad blocker adoption on PCs and mobile devices.