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also ce·lom (sē′ləm)
n. pl. coeloms or coe·lo·ma·ta (-lə-mä′tə, -măt′ə) 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 Indo-European roots.]

coe·lom′ic (sĭ-lŏm′ĭk, -lō′mĭk) adj.


(ˈsiːləʊm; -ləm) or


(Zoology) the body cavity of many multicellular animals, situated in the mesoderm and containing the digestive tract and other visceral organs
[C19: from Greek koilōma cavity, from koilos hollow; see coel-]
coelomic, celomic adj


(ˈsi ləm)

also coe•lome


n., pl. coe•loms, coe•lo•ma•ta (sɪˈloʊ mə tə) also coe•lomes.
the body cavity of higher metazoans, between the body wall and intestine, lined with a mesodermal epithelium.
[1875–80; < Greek koílōma cavity =koilō-, variant s. of koiloûn to hollow out, v. derivative of koîlos hollow + -ma n. suffix of result]
coe•lom•ic (sɪˈlɒm ɪk, -ˈloʊ mɪk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.coelom - a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavitycoelom - a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity
bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body
References in periodicals archive ?
At necropsy the alimentary canal, lungs, liver, kidneys, urinary bladder, coelomic cavity, musculature, and integument were examined for parasites by dissection.
The most common radiographic alterations of the coelomic organs in backyard poultry are found in the GIT, liver, and female genital tract.
DISCUSSION: The mullerian or paramesonephric ducts arise as longitudinal invaginations of the coelomic epithelium along the anterolateral surfaces of the nephrogenital ridges in the posterior abdominal wall.
Eggs contain the 170-kDa MYP (egg-type MYP), the coelomic fluid contains the 180- kDa MYP (coelomic fluid-type MYP), and nutritive phagocytes contain both types.
A total of 20-30 nematodes, approximately 20-30 cm in length, were found in the coelomic cavity and in the thoracic and abdominal air sacs, which were diffusely opaque and thickened.
4) The insect does not bite or sting, but it releases its coelomic fluid during accidental brushing against or crushing of the insect over the skin.
In all regions of the digestive tube, the wall of the gut consists of three layers--a folded innermost luminal (digestive) epithelium, which is endodermal in origin; an outermost complex muscular mesothelium (gut coelomic epithelium), which derives from the mesoderm; and a connective tissue layer, sandwiched between the two epithelia and delimited by their basal laminae.
Five free worms were recovered from the coelomic cavity of an adult female (snout-vent length 141mm; UNM 23642) taken on 16 June 1969 at a place 6.
Additionally, the physical examination revealed a mildly distended coelomic cavity and an enlarged, fluid-filled uropygial gland.
Three female specimens (T1163_28, T1163_43, and T1163_70) were measured to determine the proportions of different tissue types: ovary, bacteriocytes, body wall (equivalent to epidermis plus muscle layer plus nonsymbiotic cells of trophosome), and coelomic cavity.
Radiographs revealed a large soft tissue opacity extending throughout most of the ventral coelomic cavity consistent with a generalized expansion of the hepatic silhouette (Fig 2).