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(mith'ri-dā'tizm, mith-rid'ă-tizm),
Immunity against the action of a poison produced by small and gradually increasing doses of the same.
[Mithridates, King of Pontus (132-63 BCE), supposedly an unsuccessful suicide (by poison) because of repeated small doses taken to become invulnerable to assassination by poison]


Tolerance or immunity to a poison acquired by taking gradually larger doses of it.

mith′ri·dat′ic (-dăt′ĭk) adj.
Tolerance against a toxin, induced by gradually increasing its levels in the body, a technique which is similar to tolerisation therapy in allergy medicine