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Definition of HAMMER
a: a hand tool consisting of a solid head set crosswise on a handle and used for pounding
b: a power tool that often substitutes a metal block or a drill for the hammerhead
: something that resembles a hammer in form or action: as
a: a lever with a striking head for ringing a bell or striking a gong
b (1): an arm that strikes the cap in a percussion lock to ignite the propelling charge (2): a part of the action of a modern gun that strikes the primer of the cartridge in firing or that strikes the firing pin to ignite the cartridge
Tool for pounding or delivering repeated blows. Hand hammers have a handle and striking head. Surfaces of hammerheads vary in size, angle of orientation to the handle (parallel or inclined), and type of face (flat or convex). Carpenters' hammers often have a claw on the head for extracting nails. Weights range from a few ounces or grams up to 15 lbs (7 kg) for hammers used in breaking stones. Steam hammers often use, in addition to gravity, a downward thrust from a steam-activated piston. Pneumatic (air-driven) hammers include the hammer drill, for rock and concrete, and the riveting hammer, for construction operations involving steel girders and plate.