Main Entry: acoe·lo·mate

Pronunciation: \(ˌ)ā-ˈsē-lə-ˌmāt\

Function: noun

Date: circa 1889

: an invertebrate lacking a coelom; especially : one belonging to the group comprising the flatworms and nemerteans and characterized by bilateral symmetry and a digestive cavity that is the only internal cavity

— acoelomate adjective