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Hollowness. [Obs.] The cavity or hollowness of the place. Goodwin.

A concave surface, or the space bounded by it; the state of being concave.

The belly, or that part of the body between the thorax and the pelvis. Also, the cavity of the belly, which is lined by the peritoneum, and contains the stomach, bowels, and other viscera. In man, often restricted to the part between the diaphragm and the commencement of the pelvis, the remainder being called the pelvi…

Of or pertaining to the abdomen; ventral; as, the abdominal regions, muscles, cavity.

The cavity in which the leg of an insect is inserted at its articulation with the body.

An air sac, sometimes double or variously lobed, in the visceral cavity of many fishes. It originates in the same way as the lungs of air-breathing vertebrates, and in the adult may retain a tubular connection with the pharynx or esophagus.

A cavity in the cellular tissue of plants, containing air only.

A chamber or cavity filled with air, in an animal or plant.

A small cavity in a coral, shell, or fossil

Produced by, or indicating, a cavity in the lungs, not filled, and giving a sound like that produced by blowing into an empty decanter; as, amphoric respiration or resonance.

the power of voluntary motion, and also characterized by taking its food into an internal cavity or stomach for digestion; by giving carbonic acid to the air and taking oxygen in the process of respiration; and by increasing in motive power or active aggressive force with progress to maturity.

our in the latter. They are used as organs of touch, and in some species of Crustacea the cavity of the ear is situated near the basal joint. In insects, they are popularly called horns, and also feelers. The term in also applied to similar organs on the heads of other arthropods and of annelids.

A cavity which leads into the stomach, as in birds. Ray.

The male reproductive apparatus in the lower, consisting of a cell or other cavity in which spermatozoids are produced; -- called also spermary. -- An`ther*id"i*al, a.

A cavern or cavity, esp. an anatomical cavity or sinus. Huxley.

The cavity under the shoulder; the armpit. Bacon.

A piece of tallow placed in a cavity at the lower end of a sounding lead, to bring up the sand, shells, etc., of the sea bottom. Totten.

A collection of serous fluid in the cavity of the abdomen; dropsy of the peritoneum. Dunglison.

A cavity in ascidians into which the intestine and generative ducts open, and which also receives the water from the gills. See Ascidioidea.

The armpit, or the cavity beneath the junction of the arm and shoulder.