'perianthial' originates from the Greek word 'perianthos', where 'peri-' meant 'around' and 'anthos' meant 'flower'.

'perianthos' transformed into the New Latin word 'perianthium', and eventually became the modern English word 'perianthial'.

Initially, it meant 'around the flower', but over time it evolved into its current meaning of 'relating to or resembling a perianth'.