Medical Definition of typhus
: any of various bacterial diseases caused by rickettsial bacteria: asa: a severe human febrile disease that is caused by one (Rickettsia prowazekii) transmitted especially by body lice and is marked by high fever, stupor alternating with delirium, intense headache, and a dark red rash—called also b: murine typhusc: scrub typhus
Seen and Heard
What made you want to look up typhus? Please tell us where you read or heard it (including the quote, if possible).