'arolium' originates from New Latin (entomological), specifically the Latinized form 'arolium' used in anatomical descriptions.

'arolium' was adopted into English scientific and entomological usage from New Latin in the 19th century without major change in form, remaining 'arolium' (plural 'arolia').

Initially it referred generally to a small pad or cushion in anatomical descriptions; over time it became specialized to mean the 'adhesive pad between tarsal claws' in insects.