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|Noun||1.||cavum - (anatomy) a natural hollow or sinus within the body|
blastocele, blastocoel, blastocoele, cleavage cavity, segmentation cavity - the fluid-filled cavity inside a blastula
archenteron - central cavity of the gastrula; becomes the intestinal or digestive cavity
body, organic structure, physical structure - the entire structure of an organism (an animal, plant, or human being); "he felt as if his whole body were on fire"
anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure"
sinus - any of various air-filled cavities especially in the bones of the skull
lumen - a cavity or passage in a tubular organ; "the lumen of the intestine"
socket - a bony hollow into which a structure fits
pulp cavity - the central cavity of a tooth containing the pulp (including the root canal)
cranial orbit, eye socket, orbital cavity, orbit - the bony cavity in the skull containing the eyeball
buccal cavity - the cavity between the jaws and the cheeks
antrum - a natural cavity or hollow in a bone
cloaca - (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open
vestibule - any of various bodily cavities leading to another cavity (as of the ear or vagina)
mediastinum - the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus
middle ear, tympanic cavity, tympanum - the main cavity of the ear; between the eardrum and the inner ear
pleural cavity - the cavity in the thorax that contains the lungs and heart
chamber - an enclosed volume in the body; "the chambers of his heart were healthy"
amniotic cavity - the fluid-filled cavity that surrounds the developing embryo
greater peritoneal sac, peritoneal cavity - the interior of the peritoneum; a potential space between layers of the peritoneum
bursa omentalis, lesser peritoneal cavity, omental bursa - an isolated part of the peritoneal cavity that is dorsal to the stomach
pericardial cavity, pericardial space - the space between the layers of the pericardium that contains fluid that lubricates the membrane surfaces and allows easy heart movement
vacuole - a tiny cavity filled with fluid in the cytoplasm of a cell
ventricle - one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid
sac - a structure resembling a bag in an animal
uterine cavity - the space inside the uterus between the cervical canal and the Fallopian tubes
nasal cavity - either of the two cavities lying between the floor of the cranium and the roof of the mouth and extending from the face to the pharynx
nasopharynx - cavity forming the upper part of the pharynx
oropharynx - cavity formed by the pharynx at the back of the mouth
laryngopharynx - the lower part of the pharynx
blind gut, caecum, cecum - the cavity in which the large intestine begins and into which the ileum opens; "the appendix is an offshoot of the cecum"
tubular cavity - a cavity having the shape of a tube
armpit, axilla, axillary cavity, axillary fossa - the hollow under the arm where it is joined to the shoulder; "they were up to their armpits in water"
chest cavity, thoracic cavity - the cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the lungs and heart
abdominal cavity, abdomen - the cavity containing the major viscera; in mammals it is separated from the thorax by the diaphragm
renal pelvis, pelvis - a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter
pelvic cavity - the space bounded by the bones of the pelvis and containing the pelvic viscera
celom, celoma, coelom - a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity