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a boiler, containing the flues. -- Barrel of the ear (Anat.), the tympanum, or tympanic cavity. -- Barrel organ, an instrument for producing music by the action of a revolving cylinder. -- Barrel vault. See under Vault.

A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell o…

The part of anything which resembles the human belly in protuberance or in cavity; the innermost part; as, the belly of a flask, muscle, sail, ship. Out of the belly of hell cried I. Jonah ii. 2.

which encompasses and fastens a jewel or other object, as the crystal of a watch, in the cavity in which it is set.

The cavity of the blastosphere, or segmentation cavity.

The pore or opening leading into the cavity of invagination, or archenteron.

The internal cylindrical cavity of a gun, cannon, pistol, or other firearm, or of a pipe or tube. The bores of wind instruments. Bacon. Love's counselor should fill the bores of hearing. Shak.

alled simply bulb. -- Bulb of a tooth, the vascular and nervous papilla contained in the cavity of the tooth.

The middle part, cavity, or belly of a sail; the part of a furled sail which is at the center of the yard. Totten.

Any sac or saclike cavity; especially, one of the synovial sacs, or small spaces, often lined with synovial membrane, interposed between tendons and bony prominences.

The sperm whale (Physeter macrocephalus). It has in the top of its head a large cavity, containing an oily fluid, which, after death, concretes into a whitish crystalline substance called spermaceti. See Sperm whale.

A cavity open at one end, as the blind end of a canal or duct.

An upward concavity in the under side of a beam, girder, or lintel; also, a slight upward concavity in a straight arch. See Hogback. Camber arch (Arch.), an arch whose intrados, though apparently straight, has a slightly concave curve upward. -- Camber beam (Arch.), a beam whose under side has a concave curve upward.…

A hollow place in the earth, either natural or artificial; a subterraneous cavity; a cavern; a den.

Full of caverns; resembling a cavern or large cavity; hollow.

Containing a body cavity; as, the cavitary or nematoid worms.

Any small cavity, or hollow place.

A compartment or cell; an inclosed space or cavity; as, the chamber of a canal lock; the chamber of a furnace; the chamber of the eye.

A small black spot or mark remaining in the cavity of the corner tooth of a horse after the large spot or mark has become obliterated.

To fill up, as a cavity. "The woodwork . . . exactly chocketh into joints." Fuller.