apse
Concise Oxford English Dictionary © 2008 Oxford University Press:
apse /aps/
▶noun
- 1 a large semicircular or polygonal recess with a domed roof, typically at a church's eastern end.
- 2 another term for apsis.
– derivatives
apsidal /ˈapsɪd(ə)l/ adjective.
apsidal /ˈapsɪd(ə)l/ adjective.
'apse' also found in these Oxford entries:

