Main Entry: hy·pae·thral

Pronunciation: \hī-ˈpē-thrəl\

Function: adjective

Etymology: Latin hypaethrus exposed to the open air, from Greek hypaithros, from hypo- + aithēr ether, air — more at ether

Date: 1794

1 : having a roofless central space <hypaethral temple>
2 : open to the sky