'acaridan' originates from Greek, specifically the word 'akari', where 'a-' meant 'without' and 'kari' meant 'head', referring to the small size and headless appearance of mites.

'akari' transformed into the Latin word 'acarus', and eventually became the modern English word 'acaridan' through scientific classification.

Initially, it meant 'small headless creature', but over time it evolved into its current meaning of 'a member of the order Acarida'.