Noun
A room in a public building, furnished with seats.
The projection of any part of a building in a rounded form.
Any out-of-door seat in stone, large enough for several persons; esp., one of curved form.
Source: Webster's dictionaryA statuary bust was added to the exedra in 1927, a rarity, because graven images are forbidden in Jewish cemeteries. Source: Internet
The part under the exedra is covered. Source: Internet