Main Entry: acoe·lo·mate

Pronunciation: \(ˈ)ā-ˈsē-lə-ˌmāt\

Function: noun

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

—acoelomate adjective