Antagonist (Noun)
Meaning 1
A drug that neutralizes or counteracts the effects of another drug.
Classification
Nouns denoting man-made objects.
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Meaning 2
Someone who offers opposition.
Classification
Nouns denoting people.
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Meaning 3
A muscle that relaxes while another contracts; "when bending the elbow the triceps are the antagonist".
Classification
Nouns denoting body parts.