'regionally-banned' is a compound formed from the adverb 'regionally' (from adjective 'regional' + suffix '-ly') and the past-participle/ adjective 'banned'. 'regional' derives from Latin 'regio' (region), and 'ban' traces to Old English 'bannan' meaning 'to summon, command, prohibit.'

'region' comes from Latin 'regio' (area, direction) and passed into Old French and Middle English as 'region'; 'ban' comes from Old English 'bannan' (to prohibit/command) and developed into the modern verb 'ban' and adjective 'banned'. The modern compound 'regionally banned' is a straightforward modern English formation combining an adverb + past-participle adjective.

Initially, 'ban' meant 'to proclaim or command' and specifically 'to prohibit by authority'; over time that sense narrowed to 'to prohibit', and the compound 'regionally-banned' now specifically means 'forbidden in particular regions rather than universally.'