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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 ?
Endoparasites may grow in starfish' coeloms (Stone, 1987), and forcible expulsion could serve where encapsulation fails.
A parallel situation exists for the phylum Hemichordata, wherein enteropneusts form their coeloms largely by enterocoely, but pterobranchs do so by schizocoely (Lester, 1988); however, an evolutionary explanation of the difference is hampered by current uncertainty as to whether pterobranchs are basal or derived within the phylum (Sato et al.
The origin of the adult rudiment on the left side of the larval gut in echinoids and asteroids is an obvious departure from bilateral symmetry for internal structures such as coeloms and gene expression territories.
Axons extend beneath the ciliated bands and to the muscles derived from the coeloms (Lacalli and West, 1993).
membranacea within the paternal coeloms (perivisceral and lophophoral), in seawater after spawning, and within the lophophores of conspecifics.
Meanwhile, from the anterior portion of the new gut, an entirely new set of coeloms is formed by lateral evagination of the newly formed digestive system (Fig.
These observations are consistent with those of Bonch-Bruevich and Malakhov (1987), who report one unpaired preoral coelom and three pairs of trunk coeloms, although we were unable to locate with certainty the boundaries between the trunk cavities.
Over the course of 3 to 4 days, the posterolateral arms regenerate the structures typical of an ophiopluteus, including the gut, the coeloms, and additional feeding arms [ILLUSTRATION FOR FIGURES 1C, 2C OMITTED].
We did not observe that coeloms develop through the typical enterocoelic phenomena characteristic of most echinoderms (Czihak, 1971).
The right and left posterior coeloms are also present in 3-day-old larvae as elongate extensions of the anterior coelom on either side of the gut [ILLUSTRATION FOR FIGURE 3C OMITTED].
membranacea oocytes was investigated by removing oocytes from maternal coeloms by dissection and rinsing them with seawater.