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acoelomate

[ey-see-luh-meyt, ey-see-loh-mit]Zoology
adjective
  1. 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.
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noun
  1. any organism that lacks a cavity between the body wall and the digestive tract, including the flatworms, nemertines, and sea anemones.
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Origin of acoelomate

First recorded in 1875–80; a-6 + coelomate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018