acoelomate
acoe·lo·mate
noun \(ˈ)ā-ˈsē-lə-ˌmāt\Definition of ACOELOMATE
: 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
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