Malarial/məˈleriəl/ Definition 1 of 3Pro Tip 1/2Medical Condition Use 'malarial' to specify complications resulting from malaria, not other illnesses. Her joint pain was diagnosed as a malarial complication. Pro Tip 2/2Specific Illness 'Malarial' is not used for general fever or infections, only those caused by malaria. The clinic specializes in treating malarial symptoms.