scarlet fever scar·let fever (skär'lĭt)
n.
An acute contagious disease caused by a hemolytic streptococcus, occurring predominantly among children and characterized by a scarlet skin eruption and high fever. Also called scarlatina.
An acute and contagious disease caused by a kind of streptococcus. Characterized by fever, sore throat, and a bright red rash, scarlet fever can be treated with penicillin.