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An animal that lacks a coelom. Acoelomates, which include flatworms and tapeworms, exhibit bilateral symmetry and have no body cavity between the gut and the epidermis.

[New Latin Acoelōmata, group name : a- + Greek koilōma, koilōmat-, cavity; see coelom.]

a·coe′lo·mate (-lə-mĭt) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(eɪˈsiːləˌmeɪt) biology
any animal without a body cavity, such as a flatworm
relating to an animal without a body cavity
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(eɪˈsi ləˌmeɪt, ˌeɪ siˈloʊ mɪt)
1. lacking a body cavity or coelom.
2. any organism that lacks a cavity between the body wall and the digestive tract, as the flatworms, nemerteans, and jellyfishes.
[1875–80; a-6 + coelom + -ate1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
They are acoelomate: the body cavities between the digestive tract and the outer body wall are filled with parenchymal cells.
The Invertebrates: Platyhelminthes and Rhynchocoela, the Acoelomate Bilateria, Vol.