Noun
(architecture) an arch constructed of masonry courses that are corbelled until they meet
Source: WordNetA corbel arch is constructed by adding layers of stones to the walls on either side of an opening, with each successive layer projecting further towards the centre than the one supporting it from below, until the two sides meet in the middle. Source: Internet
Corbelling Corbelled arch at the south gate of Angkor Thom Corbelled hallway at Ta Prohm Angkorian engineers tended to use the corbel arch in order to construct rooms, passageways and openings in buildings. Source: Internet