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 ]

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 ]

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 ]

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 ]