antagonist

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antagonist

1. any muscle that opposes the action of another
2. a drug that counteracts the effects of another drug

antagonist

[an′tag·ə‚nist]
(biochemistry)
A molecule that bears sufficient structural similarity to a second molecule to compete with that molecule for binding sites on a third molecule.
(pharmacology)
A drug or other chemical substance capable of reducing the physiological activity of another chemical substance; refers especially to a drug that opposes the action of a drug or other chemical substance on the nervous system by combining with and blocking the nerve receptor.
(physiology)
A muscle that contracts with, and limits the action of, another muscle, called an agonist, with which it is paired.
References in periodicals archive ?
'The two dogs stopped fighting because they realised that their main enemy was not Dog A vs Dog B or Dog B vs Dog A.
I have no reason to alter my view that the main enemy for the western powers as well as Germany was the Soviet Union and the possibility of the triumph of communism.
Perhaps the main enemy for the Americans is a lack of big international tournament experience given that among their forwards only Anthony Davis played in the 2012 London Olympic Games.
Contract awarded for Sports and parks main enemy Corporation (Electric)
A helicopter buzzed overhead as some chanted "The main enemy is in the Kremlin.
p.17 (Holiday films) With a name derived from the primitive Germanic verb "smugan," meaning to squeeze through a hole, the wicked, wolfish dragon is the main enemy in "The Hobbit" novel.
The Tea Party's main enemy in US politics is the far left of Obama's Democratic Party: The Workers World Party (WWP), a Stalinist group founded in 1959 (see Workers World in Google).
Second, we should not make a mistake in knowing the main enemy, who in the present time is global arrogance [meaning the West] and the criminal Zionist network.
They say the scandal has shown how the police see Bulgarian citizens as their main enemy.
He added that our main enemy is the Qaeda and Bth, not the Kurds nor the Sunnis or other minorities; we have to unite against our enemies.
Their main enemy, apart from slugs, is hellebore leaf spot, a fungal disease that attacks leaves, flowers and stems.
Obama has prolonged Syria's civil war, increased regional instability, and delivered a strategic gift to Iran, the main enemy of Israel and the U.S.