Bas-relief (or Basso-relievo)

Bas-Relief (Or Basso-Relievo)

is sculptured work the figures of which project less than half their true proportions from the wall or surface on which they are carved. When the projection is equal to half the true proportions it is called mezzo-relievo; when more than half it is alto-relievo. — Parker, Gloss. of Architect. s.v.