different between antagonist vs methylnaltrexone

English

Etymology

From Latin antagonista, from Ancient Greek ???????????? (antag?nist?s, “opponent”) (???? (antí, “against”) + ????????? (ag?nist?s, “a combatant, pleader, actor”)), from ?????????????? (antag?nízesthai, “antagonize”).

Pronunciation

• IPA^(key): /æn?tæ??n?st/

Noun

antagonist (plural antagonists)

1. An opponent or enemy.
   • 1594, Richard Hooker, Of the Lawes of Ecclesiastical Politie

     our antagonists in these controversies

2. One who antagonizes or stirs.
3. (biochemistry) A chemical that binds to a receptor but does not produce a physiological response, blocking the action of agonist chemicals.
   • 2001: The calcium antagonists represent one of the top ten classes of prescription drugs in terms of commercial value, with worldwide sales of nearly $10 billion in 1999. — Leslie Iversen, Drugs: A Very Short Introduction (Oxford 2001, p. 41)
4. (authorship) The main character or force opposing the protagonist in a literary work or drama.
5. (anatomy) A muscle that acts in opposition to another.

   A flexor, which bends a part, is the antagonist of an extensor, which extends it.

Antonyms

• protagonist
• agonist (biochemistry)

Related terms

Translations

Anagrams

• stagnation

Danish

Noun

antagonist c (singular definite antagonisten, plural indefinite antagonister)

1. (literature) antagonist

Declension

Synonyms

• skurk

Further reading

• “antagonist” in Den Danske Ordbog

Romanian

Etymology

From French antagoniste, from Latin antagonista.

Adjective

antagonist m or n (feminine singular antagonist?, masculine plural antagoni?ti, feminine and neuter plural antagoniste)

1. antagonist

Declension

English

Etymology

From methyl +? naltrexone.

Noun

methylnaltrexone (uncountable)

1. (pharmacology) A peripherally-acting ?-opioid antagonist that acts to reverse some of the side effects of opioid drugs such as constipation without affecting analgesia or precipitating withdrawals.