'typhoidal' originates from the word 'typhoid', which is derived from the Greek word 'typhos', meaning 'fever'.

'typhos' transformed into the French word 'typhoïde', and eventually became the modern English word 'typhoid', from which 'typhoidal' is derived.

Initially, it meant 'fever-like', but over time it evolved into its current meaning of 'relating to or resembling typhoid fever'.