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

'perianthos' transformed into the English word 'perianth,' and eventually became the modern English word 'perianthless' by adding the suffix '-less' to indicate absence.

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