Definition of purple fever in US English:

purple fever

noun

Medicine
historical
  • Any of various infectious diseases accompanied by a dark red or purplish, often petechial, rash.

Origin

Early 17th century; earliest use found in John Chamberlain (1553–1628), letter writer. From purple + fever.

Pronunciation

purple fever

/ˌpəːpl ˈfiːvə/