Nehama (med_cat) wrote in 1word1day,

Friday word: Tachyphylaxis

tachyphylaxis [tak′ēfəlak′sis]

1 (in pharmacology) a phenomenon in which the repeated administration of some drugs results in a rapidly appearing and marked decrease in effectiveness.
2 also called mithridatism. (in immunology), a rapidly developing immunity to a toxin because of previous exposure, such as from previous injection of small amounts of the toxin (named for Mithridates VI who used the technique to survive an assassination attempt).

Etymology: Gk, tachys, rapid + phylax, guard
Mosby's Medical Dictionary, 8th edition. © 2009, Elsevier.

Further re: meaning #1: this was a new word from my reading this week; it is the same phenomenon that's called "tolerance" with narcotics, when applied to non-narcotic substances, such as sedatives, neuromuscular blocking agents (i.e., paralytics, incl. curare derivatives), etc.

Tags: greek, medical, noun, t, wordsmith: med_cat

  • Tuesday word: Intrepid

    Tuesday, Oct. 12, 2021 Intrepid (adjective) in·trep·id [in-trep-id] adjective 1. resolutely fearless; dauntless: an intrepid explorer. WORDS…

  • Sunday Word: Copacetic

    Sunday Word: Copacetic copacetic [koh-p uh- set-ik, - see-tik] adjective: (informal) fine, OK, agreeable, totally satisfactory, in excellent…

  • Tuesday word: Servile

    Tuesday, Oct. 5, 2021 Servile (adjective) ser·vile [sur-vil, -vahyl] adjective 1. slavishly submissive or obsequious; fawning: servile…

  • Post a new comment


    Comments allowed for members only

    Anonymous comments are disabled in this journal

    default userpic

    Your reply will be screened

    Your IP address will be recorded