triapsal
adjective
tri·ap·sal
(ˈ)trī¦apsəl
variants or less commonly triapsidal
-sədᵊl
: having three apses —used of a building
the apses in a triapsal church may be side by side at the east end or they may be projected from a central tower
Word History
Etymology
triapsal from tri- + apse + -al; triapsidal from tri- + apsidal