'pro-dynastic' is a Modern English compound combining the prefix 'pro-' (from Latin 'pro', meaning 'for' or 'in favor of') with 'dynastic', which derives from 'dynasty' ultimately from Greek 'dynastēs' (ruler).

'dynasty' entered English via late Latin and Old French (e.g. French 'dynastie') from Greek 'dynastía'/'dynastēs'; the productive English prefix 'pro-' (from Latin) later combined with adjectives like 'dynastic' to form compounds such as 'pro-dynastic' in modern political usage.

Originally the elements meant 'for' ('pro-') and 'ruler/power' (Greek roots referring to rulers); over time the compound came to mean specifically 'in favor of a ruling family or dynasty' in contemporary political contexts.