'acinetan' originates from Greek, specifically the word 'akinētos,' where 'a-' meant 'not' and 'kinētos' meant 'movable.'

'akinētos' transformed into the scientific term 'Acinetae' in Latin, and eventually became the modern English word 'acinetan.'

Initially, it meant 'immovable,' but over time it evolved into its current meaning of 'a member of the Acinetae group.'