Antagonist (disambiguation)

Antagonist ( ancient Greek ἀνταγωνιστής antagonistés of ἀντί anti "against" and ἄγω ago " I act, move, execute ": " the counter- doer ", " the opponent " ) generally refers to an adversary or opponent.

In particular:

Antagonist ( literature), the opponent the protagonist
Antagonist ( ecology), a species that is in competition or foe relationship to another type
Antagonist (muscle ), a muscle that is stretched when the agonist performs a movement or holding work
Antagonist ( Pharmacology ), a substance which inhibits an agonist in its effect without inducing an effect even
Antagonist (dentistry ), a one particular tooth opposing tooth

Antagonism may refer to:

Contradiction ( dialectic )
Contrast
Hostility