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

  • n. The cavity within the body of all animals higher than the coelenterates and certain primitive worms, formed by the splitting of the embryonic mesoderm into two layers. In mammals it forms the peritoneal, pleural, and pericardial cavities. Also called body cavity.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fluid-filled cavity within the body of an animal. The digestive system is suspended within the cavity, which is lined by a tissue called the peritoneum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity


German Koelom, from Greek koilōma, cavity, from koilos, hollow; see keuə- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek κοίλωμα (koiloma, "hollow, cavity"). (Wiktionary)



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  • That's why love hurts frogapplause, for snails at least.

    March 16, 2011

  • Snails collect their metabolic wastes in the coelom - which has been reduced to a sac surrounding the heart.

    March 16, 2011