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| the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language). |
| a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S. |
pyrimethamine py·ri·meth·a·mine (pī'rə-měth'ə-mēn', -mĭn)
n.
A potent folic acid antagonist used as a prophylactic antimalarial agent against Plasmodium falciparum and in the treatment of toxoplasmosis.