TACHYPHYLAXIS

PRONUNCIATION: (tak-uh-fi-LAK-sis)

MEANING: noun: Mithridatism: Successively decreased response to a drug or a toxin over time.

ETYMOLOGY: From Greek tachy- (swift) + phylaxis (protection). Earliest documented use: 1911.
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Tachyphylaxis I know; it's Mithraditism I never heard of before!
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STACHYPHYLAXIS - takes longer and longer to accumulate chips at the poker table

PACHYPHYLAXIS - and the Elephant plants aren't growing very fast now, either

TACHYPHYTAXIS - fast plants that'll take you where you want to go, for a fee