the word 'typhus' entered english in the late 18th century from modern latin, which itself adopted the term from greek 'typhos', meaning 'smoke' or 'stupor'. the greek term is related to 'typhein', meaning 'to smoke'. this etymology reflects the hazy, delirious state of mind characteristic of the fever caused by the disease. the connection between 'smoke' and 'feverish stupor' illustrates a metaphorical shift from a physical phenomenon to a medical condition, a common path in the evolution of medical terminology.

this word is a loanword adopted as a single unit into english. it does not contain separable morphemes within its modern english spelling.