Main Entry: con·ta·gium Pronunciation: k&n-'tA-j(E-)&m Function: noun Inflected Form: pluralcon·ta·gia/-j(E-)&/ : a virus or living organism capable of causing a communicable disease
contagium con·ta·gium (kən-tā'jəm) n.pl.con·ta·gia (-jə) The direct cause, such as a bacterium or virus, of a communicable disease. Also called contagion.