mithridatism noun. ['mɪƟrɪdeɪtɪz(ǝ)m, mɪ'Ɵrɪdǝtɪz(ǝ)m] M19.
[from Mithridates (see MITHRIDATIC) + -ISM.]
Immunity to a poison induced by administering gradually increased doses of the poison.

■ mi'thridatize verb trans. make proof against a poison by the administration of gradually increasing doses of it M19.

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