hammer
noun
1.
the part of a gunlock that strikes the percussion cap when the trigger is pulled
2.
a hand tool with a heavy rigid head and a handle; used to deliver an impulsive force by striking
Derived from:
hammer 3.
the ossicle attached to the eardrum
4.
a light drumstick with a rounded head that is used to strike such percussion instruments as chimes, kettledrums, marimbas, glockenspiels, etc.
5.
a heavy metal sphere attached to a flexible wire; used in the hammer throw
6.
a striker that is covered in felt and that causes the piano strings to vibrate
7.
a power tool for drilling rocks