acoelomate
[ ey-see-luh-meyt, ey-see-loh-mit ]
/ eɪˈsi ləˌmeɪt, ˌeɪ siˈloʊ mɪt /
adjective
Also a·coe·lom·a·tous
[ey-see-lom-uh-tuh s, -loh-muh-] /ˌeɪ siˈlɒm ə təs, -ˈloʊ mə-/, a·coe·lo·mous.
having no coelum.
noun
any organism that lacks a cavity between the body wall and the digestive tract, including the flatworms, nemertines, and sea anemones.