IPA: //ˈɔːltərˌpiːs//
KK: /ˈɔltərˌpis/
A piece of art, like a painting or sculpture, that is positioned above and behind an altar in a church.
The altarpiece in the cathedral was a stunning example of Renaissance art.
Altarpiece is formed from "altar" (from Latin "altare", meaning a raised structure for religious offerings) and "piece" (from Old French "piece", meaning a part or portion). The word refers to a work of art that is part of or placed on an altar, typically in a church setting.
Think of an 'altar' as a raised structure for worship and a 'piece' as a part of art — an altarpiece is a piece of art associated with an altar.