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A falling in of the surface; a sinking below its true place; a cavity or hollow; as, roughness consists in little protuberances and depressions.

A hollow internally threaded screw-cutting tool, made in one piece or composed of several parts, for forming screw threads on bolts, etc.; one of the separate parts which make up such a tool. Cutting die (Mech.), a thin, deep steel frame, sharpened to a cutting edge, for cutting out articles from leather, cloth, paper,…

To hollow out, as a well; to form, as a ditch, by removing earth; to excavate; as, to dig a ditch or a well.

a mournful character, to accompany funeral rites; a funeral hymn. The raven croaked, and hollow shrieks of owls Sung dirges at her funeral. Ford.

A hollow place, as in a field. Ogilvie.

ing; to plunge into. [R.] The Curtii bravely dived the gulf of fame. Denham. He dives the hollow, climbs the steeps. Emerson.

cidæ, which habitually lives under water; - - called also water tiger. -- Diving bell, a hollow inverted vessel, sometimes bell-shaped, in which men may descend and work under water, respiration being sustained by the compressed air at the top, by fresh air pumped in through a tube from above. -- Diving dress. See Su…

A hollow tile used in making drains; -- called also draining tile.

Diamond. -- Drill jig. See under Jig. -- Drill pin, the pin in a lock which enters the hollow stem of the key. -- Drill sergeant (Mil.), a noncommissioned officer whose office it is to instruct soldiers as to their duties, and to train them to military exercises and evolutions. -- Vertical drill, a drill press.…

An instrument of percussion, consisting either of a hollow cylinder, over each end of which is stretched a piece of skin or vellum, to be beaten with a stick; or of a metallic hemisphere (kettledrum) with a single piece of skin to be so beaten; the common instrument for marking time in martial music; one of the pair of…

A dilatation of a hollow organ or of a canal.

The slender, hollow thread of a nettling cell or cnida. See Nettling cell. [Written also ecthoræum.]

Want of solidity or substance; unsatisfactoriness; inability to satisfy desire; vacuity; hollowness; the emptiness of earthly glory.

Unable to satisfy; unsatisfactory; hollow; vain; -- said of pleasure, the world, etc. Pleas'd in the silent shade with empty praise. Pope.

k like a ewe; -- said of horses in which the arch of the neck is deficent, being somewhat hollowed out. Youwatt.

To hollow out; to form cavity or hole in; to make hollow by cutting, scooping, or digging; as, to excavate a ball; to excavate the earth.

The act of excavating, or of making hollow, by cutting, scooping, or digging out a part of a solid mass.

One who, or that which, excavates or hollows out; a machine, as a dredging machine, or a tool, for excavating.

One who, or that which, extinguishes; esp., a hollow cone or other device for extinguishing a flame, as of a torch or candle.

efeat, as in controversy. [Collog.] I should have been a stercoraceous mendicant if I had hollowed when I got a facer. C. Kingsley.