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 ?
Although the UK and Germany were notional enemies at times (Red and Black respectively), the main enemy was Japan (Orange).
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.
Today the Seemandhra region (fly) is taking revenge on Sonia Gandhi because the main enemy of today's Andhra is Sonia Gandhi.
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.
Undoubtedly, the main enemy of the Lebanese people is the Zionist regime, who benefits more from the instability and lack of security in the region," he added.
Although Everton are traditionally Liverpool's local rivals, in terms of being England's top dogs - in terms of honours won domestically and abroad - Brown's former club Manchester United are viewed as the main enemy.
Eva Green provides the glamour, as sorceress Morgan, who gets cosy with Arthur's main enemy King Lot, played by James Purefoy.
This is clearly exemplified in the campaign raised by the West, led by the US and instigated by Israel, to stigmatize Iran as the main enemy of the Arab world, thus pushing arms sales to the Gulf region to galactic levels.