What does alto-rilievo mean?
The definition of alto-rilievo
Al”to-ri*lie*vo, n.; pl. Alto-rilievos.
Etym: [It.] (Sculp.)

High relief; sculptured work in which the figures project more than half their thickness; as, this figure is an alto-rilievo or in alto-rilievo.

Note: When the figure stands only half out, it is called mezzo- rilievo, demi-rilievo, or medium relief; when its projection is less than one half, basso-rilievo, bas-relief, or low relief.