Medical Definition of excoriation. 1: the act of abrading or wearing off the skin chafing and excoriation of the skin.
malaria. noun. 1  An infectious disease characterized by cycles of chills, fever, and sweating, caused by a protozoan of the genus Plasmodium in red blood cells, which is transmitted to humans by the bite of an infected female anopheles mosquito.
P. malariae is one of the four species of the genus Plasmodium that uses humans as a primary host. The other three species are P. falciparum, P. vivax, and P. vivale. Plasmodium malariae is the only human malaria parasite species that has a quartan cycle (three-day cycle).