amphitheatre
Amphitheatre (noun) means an open-air theatre, which may have seating all around the stage or on just one side, especially one dating from classical Greek or Roman times, or a present-day venue built along similar lines.
Etymology
From Latin amphitheatrum, from Ancient Greek ἀμφιθέατρον (amphithéatron), from ἀμφί (amphí), meaning ‘on both sides’, and θέᾱτρον (théātron), meaning ‘theatre’.