-coelous
adjective combining form 
Etymology: New Latin -coelus, from Greek -koilos hollow, concave, from koilos — more at cave 
1. : cavitied 
< dendrocoelous >
2. : concave 
< procoelous >
< opisthocoelous >
1.
< dendrocoelous >
2.
< procoelous >
< opisthocoelous >