coe·lom also ce·lom (sēləm)
n. pl. coeloms or coe·lo·ma·ta (-lə-mätə, -mătə) also ce·loms or ce·loma·ta
The fluid-filled cavity within the body of most multicellular animals, except some invertebrates such as flatworms and cnidarians, that lies between the body wall and the digestive tract and is formed by the splitting of the embryonic mesoderm into two layers. Also called body cavity.
[German Koelom, from Greek koilōma, cavity, from koilos, hollow; see keuə- in the Appendix of Indo-European roots.]
coe·lomic (sĭ-lŏmĭk, -lōmĭk) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.