Dictionary.com Thesaurus.com

coelomate vs. acoelomate

coelomate

[see-luh-meyt, si-loh-mit] / ˈsi ləˌmeɪt, sɪˈloʊ mɪt /

adjective

having a coelom.

noun

a coelomate animal.

acoelomate

[ey-see-luh-meyt, ey-see-loh-mit] / eɪˈsi ləˌmeɪt, ˌeɪ siˈloʊ mɪt /

adjective

Also acoelomatous acoelomous. 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.