'arilled' originates from Medieval Latin, specifically the word 'arillus', where 'arillus' meant 'a small skin or wrapper'.

'arilled' developed via the Medieval Latin noun 'arillus' into the English botanical noun 'aril', and the adjective sense was later formed (English) as 'arilled' to mean 'having an aril'.

Initially it referred to 'a small skin or covering' (in Medieval Latin), but over time the sense narrowed to the botanical 'extra seed-covering (aril)', and 'arilled' now means 'having such an aril'.