mithridate
/mɪθˈrɪdɪt/Definitions
1. verb
to become immune or resistant to something, especially to a particular poison or poison by gradually increasing exposure to small doses.
“After mithridating herself with small amounts of the venom, the snake handler was able to handle the deadly snake safely.”
2. noun
a substance, especially a poison, that has been used to mithridate something or someone.
“The doctor warned her about the risks of mithridate poisoning from the untested medicine.”