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tachyphylaxis

[ tak-uh-fi-lak-sis ]

noun

  1. Medicine/Medical. immediate, temporary immunization against the effects of injection of a toxic extract owing to previous small injections of the same extract.
  2. a decreased response to a medicine given over a period of time so that larger doses are required to produce the same response.

tachyphylaxis

/ ˌtækɪfɪˈlæksɪs /

noun

  1. very rapid development of tolerance or immunity to the effects of a drug
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Other Words From

  • tach·y·phy·lac·tic [tak-, uh, -fi-, lak, -tik], adjective
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Word History and Origins

Origin of tachyphylaxis1

tachy- + Greek phýlaxis a guarding, equivalent to phylak- (stem of phylássein to guard) + -sis -sis
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Word History and Origins

Origin of tachyphylaxis1

New Latin, from tachy- + phylaxis on the model of prophylaxis. See prophylactic

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tachyontachypnea

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