apse
apse \'aps\ n [ML & L; ML apsis, fr. L] 1: a projecting part of a building (as a church) usu. semicircular in plan and vaulted 2: APSIS
apse \'aps\ n [ML & L; ML apsis, fr. L] 1: a projecting part of a building (as a church) usu. semicircular in plan and vaulted 2: APSIS