basso-relievo
noun
bas·so-re·lie·vo ˌba-(ˌ)sō-ri-ˈlē-(ˌ)vō 
ˌbä-(ˌ)sō-rēl-ˈyā-(ˌ)vō
variants or less commonly basso-rilievo
: bas-relief
Word History
Etymology
Italian bassorilievo, from basso low + rilievo relief
First Known Use
circa 1639, in the meaning defined above