ˈsēləm noun
also coe·lome -ˌlōm, -_ləm ; or ce·lom -ləm
( plural coeloms -mz ; or coe·lo·ma·ta sēˈlōmədə, -äm-)
Etymology: German zölom, coelom, from Greek koilōma cavity, from koilos hollow — more at cave
: the body cavity or perivisceral cavity of metazoans above the lower worms usually being lined by a distinct epithelium and where well developed forming a large space between the alimentary viscera and the body walls — compare hemocoel , hemocoelom , pseudocoel