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.

Tachyphylaxis I know; it's Mithraditism I never heard of before!

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