Définitions
1.NounAn opponent or enemy.
2.NounOne who antagonizes or stirs.
3.NounA chemical that binds to a receptor but does not produce a physiological response, blocking the action of other agonist chemicals, such as endogenous chemical messengers.
4.NounThe main character or force opposing the protagonist in a literary work or drama.
5.NounA muscle that acts in opposition to another."A flexor, which bends a part, is the antagonist of an extensor, which extends it."