1) Ancient Roman architecture 2) Hypethral 3) Monument type 4) Unenclosed 1) Hypethral 2) Unenclosed 
Hypaethral is an ancient temple with no roof. (From the Latin hypaethrus, from Ancient Greek ὕπαιθρος hupaithros ὑπό hupo- `under` and αἰθήρ aither `sky, air`.) It has instead a hypaethros or hypaethral opening. It was described by the Roman architect Vitruvius in his treatise On Architecture written for the emperor Caesar A...
roofless; open to the sky
• (a.) Alt. of Hypethral
[adj] - partly or entirely open to the sky
hypethral adjective partly or entirely open to the sky
hypethral.