Noun
a sculptural relief in which forms extend out from the background to at least half their depth
Source: WordNetThe south door of Beauvais Cathedral is in some respects the finest in France; the upper panels are carved in high relief with figure subjects and canopies over them. Source: Internet
Carving is often highly detailed, with an intricate backing behind the main figure in high relief. Source: Internet
They were carved in high relief, a practice employed until then only in treasuries (buildings used to keep votive gifts to the gods). Source: Internet