'anti-dynast' is formed from the Greek prefix 'anti-' meaning 'against' combined with 'dynast', which comes from Greek 'dynastēs' meaning 'ruler' or 'one with power.'

'dynastēs' (Greek) passed into Late Latin/French forms (e.g. 'dynaste') and into English as 'dynast' (19th century usage meaning a member of a ruling family); the compound 'anti-dynast' is a modern English formation using the productive prefix 'anti-'.

Originally the root referred to 'one who has power' ('ruler'); over time 'dynast' came to mean 'member of a ruling family' and the modern compound 'anti-dynast' now specifically denotes opposition to dynastic/ hereditary power.