Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An animal that lacks a coelom. Acoelomates, which include the flatworm, fluke, tapeworm, and ribbon worm, exhibit bilateral symmetry and possess one internal space, the digestive cavity.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any animal without a coelom.
  • adj. Having no coelom.

Etymologies

New Latin Acoelōmata, group name : a-1 + Greek koilōma, koilōmat-, cavity; see coelom.
(American Heritage® Dictionary of the English Language, Fourth Edition)
a- +‎ coelomate (Wiktionary)

Examples

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