tri·ap·sal \(ˈ)trī|apsəl\adjective alsotri·ap·si·dal\-sədəl\ Etymology:triapsal from tri- + apse + -al; triapsidal from tri- + apsidal : 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 >