Amphitheatral :: Amphitheatral (a.) Amphitheatrical; resembling an amphitheater.
Amphitheatre :: Amphitheatre (n.) An oval or circular building with rising tiers of seats about an open space called the arena.
Amphitheatre :: Amphitheatre (n.) Anything resembling an amphitheater in form; as, a level surrounded by rising slopes or hills, or a rising gallery in a theater..