Pronunciation: (mu-lâr'ē-u),[key] —n. 1. Pathol.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.