The Collaborative International Dictionary of English v.0.48:
Mezzo-relievo \Mez"zo-re*lie"vo\, n. Mezzo-rilievo. [1913 Webster]WordNet (r) 3.0 (2006):
mezzo-relievo n 1: a sculptural relief between low relief and high relief [syn: mezzo-relievo, mezzo-rilievo, half-relief]