(Science: anatomy) 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.
also, a person of thing that smites or shatters; as, St. Augustine was the hammer of heresies. He met the stern legionaries [of Rome] who had been the massive iron hammers of the whole earth. (j. H. Newman) atmospheric hammer, a dead-stroke hammer in which the spring is formed by confined air. Drop hammer, face hammer, etc. See drop, face, etc. Hammer fish. See hammerhead. Hammer hardening, the process of hardening metal by hammering it when cold.
(Science: zoology) hammer shell, 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.
Origin: oe. Hamer, as. Hamer, hamor; akin to D. Hamer, g. & dan. Hammer, Sw. Hammare, Icel. Hamarr, hammer, crag, and perh. To gr. Anvil, Skr. Aman stone. The ossicle attached to the eardrum.The common term to the bone in the ear called the [[malleus.