demi-rilievo

from the GNU version of the Collaborative International Dictionary of English.

• noun Half relief; sculpture in relief of which the figures project from the background by one half their full roundness.
• noun A work of sculpture of the above character. See alto-rilievo.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun art Half relief; sculpture in relief, whose figures project from the background by one half their full roundness.