. a hammer powered by compressed air so as to be able to provide powerful repeated strokes; a pneumatic hammer. [ PJC ]

n. A hammer with a head formed of a bundle of square bars, with pyramidal points, arranged in rows, or a solid head with a face cut into a number of rows of such points; -- used for dressing stone. [ 1913 Webster ]

v. t. To dress with bushhammer; as, to bushhammer a block of granite. [ 1913 Webster ]

n. The yellow-hammer. [ 1913 Webster ]

v. t. [ imp. & p. p. Hammered p. pr. & vb. n. Hammering. ] 1. To beat with a hammer; to beat with heavy blows; as, to hammer iron. [ 1913 Webster ]

2. To form or forge with a hammer; to shape by beating. “Hammered money.” Dryden. [ 1913 Webster ]

3. To form in the mind; to shape by hard intellectual labor; -- usually with out. [ 1913 Webster ]

Who was hammering out a penny dialogue. Jeffry. [ 1913 Webster ]

v. i. 1. To be busy forming anything; to labor hard as if shaping something with a hammer. [ 1913 Webster ]

Whereon this month I have been hammering. Shak. [ 1913 Webster ]

2. To strike repeated blows, literally or figuratively. [ 1913 Webster ]

Blood and revenge are hammering in my head. Shak. [ 1913 Webster ]

n. [ OE. hamer, AS. hamer, hamor; akin to D. hamer, G. & Dan. hammer, Sw. hammare, Icel. hamarr, hammer, crag, and perh. to Gr. 'a`kmwn anvil, Skr. açman stone. ] 1. An instrument for driving nails, beating metals, and the like, consisting of a head, usually of steel or iron, fixed crosswise to a handle. [ 1913 Webster ]

With busy hammers closing rivets up. Shak. [ 1913 Webster ]

2. Something which in form or action resembles the common hammer; as: (a) That part of a clock which strikes upon the bell to indicate the hour. (b) The padded mallet of a piano, which strikes the wires, to produce the tones. (c) (Anat.) The malleus. See under Ear. (d) (Gun.) That part of a gunlock which strikes the percussion cap, or firing pin; the cock; formerly, however, a piece of steel covering the pan of a flintlock musket and struck by the flint of the cock to ignite the priming. (e) Also, a person or thing that smites or shatters; as, St. Augustine was the hammer of heresies. [ 1913 Webster ]

He met the stern legionaries [ of Rome ] who had been the “massive iron hammers” of the whole earth. J. H. Newman. [ 1913 Webster ]

3. (Athletics) A spherical weight attached to a flexible handle and hurled from a mark or ring. The weight of head and handle is usually not less than 16 pounds. [ Webster 1913 Suppl. ]

Atmospheric hammer, a dead-stroke hammer in which the spring is formed by confined air. --
Drop hammer,
Face hammer, etc. See under Drop, Face, etc. --
Hammer fish. See Hammerhead. --
Hammer hardening, the process of hardening metal by hammering it when cold. --
Hammer shell (Zool.), any species of Malleus, a genus of marine bivalve shells, allied to the pearl oysters, having the wings narrow and elongated, so as to give them a hammer-shaped outline; -- called also hammer oyster. --
To bring to the hammer, to put up at auction. [ 1913 Webster ]

a. Capable of being/formed or shapeo by a hammer. Sherwood. [ 1913 Webster ]

n. (Gothic Arch.) A member of one description of roof truss, called hammer-beam truss, which is so framed as not to have a tiebeam at the top of the wall. Each principal has two hammer-beams, which occupy the situation, and to some extent serve the purpose, of a tiebeam. [ 1913 Webster ]

. (Elec.) An interrupter in which contact is broken by the movement of an automatically vibrating hammer between a contact piece and an electromagnet, or of a rapidly moving piece mechanically driven. [ Webster 1913 Suppl. ]

n. [ Prob. fr. D. hemel heaven, canopy, tester (akin to G. himmel, and perh. also to E. heaven) + E. cloth; or perh. a corruption of hamper cloth. ] The cloth which covers a coach box. [ 1913 Webster ]

a. Having the surface roughly shaped or faced with the stonecutter's hammer; -- said of building stone. [ 1913 Webster ]

n. One who works with a hammer. [ 1913 Webster ]

v. t. To harden, as a metal, by hammering it in the cold state. [ 1913 Webster ]

n. 1. (Zool.) A shark of the genus Sphyrna or Zygaena, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The Sphyrna zygaena is found in the North Atlantic. Called also hammer fish, and balance fish. [ 1913 Webster ]

2. (Zool.) A fresh-water fish; the stone-roller. [ 1913 Webster ]

3. (Zool.) An African fruit bat (Hypsignathus monstrosus); -- so called from its large blunt nozzle. [ 1913 Webster ]

n. (Zool.) A bird of the Heron family; the umber. [ 1913 Webster ]

a. (Firearms) Without a visible hammer; -- said of a gun having a cock or striker concealed from sight, and out of the way of an accidental touch. [ 1913 Webster ]

. (Wrestling) A hold in which an arm of one contestant is held twisted and bent behind his back by his opponent. [ Webster 1913 Suppl. ]

n.; pl. Hammermen A hammerer; a forgeman. [ 1913 Webster ]

n. a hammer having a strong steel cutting blade, driven by compressed air in multiple rapid strokes, and used for cutting through pavement, concrete, or other hard substances.
Syn. -- air hammer, pneumatic hammer. [ WordNet 1.5 ]

n. A simpleton; a silly person. [ Colloq. ] Addison. [ 1913 Webster ]

a. (Stone Cutting) Having a surface dressed by cutting with a hammer the head of which consists of broad thin chisels clamped together. [ 1913 Webster ]

n. One who shams; an impostor. Johnson. [ 1913 Webster ]

A tilted hammer; a heavy hammer, used in iron works, which is lifted or tilted by projections or wipers on a revolving shaft; a trip hammer. [ 1913 Webster ]

A tilt hammer. [ 1913 Webster ]

(Physics) 1. A vessel partly filled with water, exhausted of air, and hermetically sealed. When reversed or shaken, the water being unimpeded by air, strikes the sides in solid mass with a sound like that of a hammer. [ 1913 Webster ]

2. A concussion, or blow, made by water in striking, as against the sides of a pipe or vessel containing it. [ 1913 Webster ]

3. A metal hammer used when heated, as by dipping in hot water, to blister the skin, as for counterritation. [ Webster 1913 Suppl. ]

n. [ For yellow-ammer, where ammer is fr. AS. amore a kind of bird; akin to G. ammer a yellow-hammer, OHG. amero. ] (Zool.) (a) A common European finch (Emberiza citrinella). The color of the male is bright yellow on the breast, neck, and sides of the head, with the back yellow and brown, and the top of the head and the tail quills blackish. Called also yellow bunting, scribbling lark, and writing lark. [ Written also yellow-ammer. ] (b) The flicker. [ Local, U. S. ] [ 1913 Webster ]