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Antagonist: In biochemistry, an antagonist acts against and blocks an action. For example, insulin lowers the level of glucose (sugar) in the blood, whereas another hormone called glucagon raises it; therefore, insulin and glucagon are antagonists.
An antagonist is the opposite of an agonist which stimulates an action. Antagonists and agonists are key players in pharmacology and in the chemistry of the human body.
Library > Literature & Language > Dictionary ( ăn-tăg ' É™-nÄst ) n. One who opposes and contends against another; an adversary. The principal character in ...
noun 1. a person who is opposed to, struggles against, or competes with another; opponent; adversary. 2. the adversary of the hero or protagonist of a drama or other ...
Definition of ANTAGONIST. 1: one that contends with or opposes another : adversary, opponent. 2: an agent of physiological antagonism: as a: a muscle that contracts ...
an·tag·o·nist (n-t g-n st) n. 1. One who opposes and contends against another; an adversary. 2. The principal character in opposition to the protagonist or hero of ...
antagonist /an·tag·o·nist/ (an-tag´o-nist) 1. a substance that tends to nullify the action of another, as a drug that binds to a cell receptor without eliciting a ...