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 classic literature ?
Not improbably he was the best workman of his time; or, perhaps, the Colonel thought it expedient, or was impelled by some better feeling, thus openly to cast aside all animosity against the race of his fallen antagonist.
Your challenge would soon be answered,'' replied the Palmer, ``were your antagonist near you.
Their antagonist was a very tall man, wearing the metal of one of your own guardsmen, and his fighting ability was little short of marvelous for he fought fair against the entire four and vanquished them by his surpassing skill and superhuman strength and endurance.
In a short while the three antagonists could be seen together in an amiable bunch.
After this, the two antagonists stood valiantly up to one another, and fought, sword to horn, for a long while.
The Blackfoot is the hereditary enemy of the Crow, toward whom hostility is like a cherished principle of religion; for every tribe, besides its casual antagonists, has some enduring foe with whom there can be no permanent reconciliation.
If so our doom was sealed, for these savages, unlike the feeble swimmer of civilized countries, are, if anything, more formidable antagonists in the water than when on the land.
He would have made war even for that honor; the cardinal, assured of governing alone, under the double pretext of having brought up the king and given his niece to him in marriage -- the cardinal would have fought all antagonists, overcome all obstacles.
How many who have deemed themselves antagonists will smile hereafter, when they look back upon the world's wide harvest field, and perceive that, in unconscious brotherhood, they were helping to bind the selfsame sheaf!
We had just finished the last of our immediate antagonists as he spoke, and I turned in surprised wonderment at the sound of my name.
With a yell of pain and fury Twala returned the blow with interest, and, such was his strength, shore right through the rhinoceros' horn handle of his antagonists battle-axe, strengthened as it was with bands of steel, wounding Curtis in the face.
To remain longer would have been a mistake: it was necessary to score a triumph over Colbert, and the only method was to touch the king so near the quick, that his majesty would have no other means of extrication but choosing between the two antagonists.