antagonist /an·tag·o·nist/ (an-tag´o-nist)
beta-adrenergic antagonist,
1. a substance that tends to nullify the action of another, as a drug that binds to a cell receptor without eliciting a biological response, blocking binding of substances that could elicit such responses.antagonis´tic
2. antagonistic muscle. 
)
Antagonist. The triceps brachii extends the forearm at the elbow while the biceps brachii, its antagonist, flexes the elbow.
3. a tooth in one jaw that articulates with one in the other jaw.
α-adrenergic antagonist alpha-adrenergic blocking agent; see adrenergic blocking agent.
β-adrenergic antagonist beta-adrenergic blocking agent; see adrenergic blocking agent.
folic acid antagonist an antimetabolite, e.g., methotrexate, that interferes with DNA replication and cell division by inhibiting the enzyme dihydrofolate reductase; used in cancer chemotherapy.
H1 receptor antagonist any of a large number of agents that block the action of histamine by competitive binding to the H1 receptor; they also have sedative, anticholinergic, and antiemetic effects and are used for the relief of allergic symptoms, as antiemetics, as antivertigo agents, and as antidyskinetics in parkinsonism.
H2 receptor antagonist an agent that blocks the action of histamine by competitive binding to the H2 receptor; used to inhibit acid secretion in the treatment of peptic ulcer.
beta-adrenergic antagonist,
beta-adrenergic blocking agent.
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