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[pahy-ruh-meth-uh-meen, -min] /ˌpaɪ rəˈmɛθ əˌmin, -mɪn/
noun, Pharmacology.
a potent substance, C 1 2 H 1 3 ClN 4 , used against susceptible plasmodia in the prophylactic treatment of malaria and against Toxoplasma gondi in the treatment of toxoplasmosis.
Origin of pyrimethamine
First recorded in 1950-55; pyrim(idine) + eth(yl) + -amine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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pyrimethamine in Medicine

pyrimethamine py·ri·meth·a·mine (pī'rə-měth'ə-mēn', -mĭn)
A potent folic acid antagonist used as a prophylactic antimalarial agent against Plasmodium falciparum and in the treatment of toxoplasmosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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