| 1. | Pathology. any of a group of diseases, usually intermittent or remittent, characterized by attacks of chills, fever, and sweating: formerly supposed to be due to swamp exhalations but now known to be caused by a parasitic protozoan, which is transferred to the human bloodstream by a mosquito of the genus Anopheles and which occupies and destroys red blood cells. |
| 2. | Archaic. unwholesome or poisonous air. |

An infectious disease caused by a parasite that is transmitted by the bite of an infected mosquito. Persons suffering from malaria experience periodic episodes of chills and fever.
malaria ma·lar·i·a (mə-lâr'ē-ə)
n.
An infectious disease characterized by cycles of chills, fever, and sweating, caused by the parasitic infection of red blood cells by a protozoan of the genus Plasmodium, which is transmitted by the bite of an infected female anopheles mosquito. Also called jungle fever, paludism, swamp fever.