1) Locomotive part 2) Support 
Headstock or peghead is a part of guitar or similar stringed instrument. The main function of a headstock is holding the instrument`s strings. Strings go from the bridge past the nut and are usually fixed on machine heads on the headstock. Machine heads are used to tune the guitar by adjusting the tension of strings and, consequentially, the pitc....[rolling stock] A headstock of a rail vehicle is a transverse structural member located at the extreme end of the vehicle`s underframe. The headstock supports the coupling at that end of the vehicle, and may also support buffers, in which case it may also be known as a buffer beam. The headstocks form part of the underframe of a locomotive ...
device for supporting end or head of a member
• (n.) The part of a lathe that holds the revolving spindle and its attachments; -- also called poppet head, the opposite corresponding part being called a tailstock. • (n.) A part (usually separate from the bed or frame) for supporting some of the principal working parts of a machine • (n.) The part of a planing machine that support...
The area of the guitar at the end of the neck where the strings are tuned.
The top section of The guitar neck for mounting The machineheads or tuning pegs
See headgear.
Head'stock` (-stŏk`) noun (Machinery) A part (usually separate from the bed or frame) for supporting some of the principal working parts of a machine ; as: (a) The part of a lathe that holds the revolving spindle and its attachments; -- also called poppet head , the opposite ...
The headstock is situated at the top of the neck. Normally this has the tuning pegs (sometimes called machine heads), and often displays the guitar company logo.
[n] - the stationary support in a machine or power tool that supports and drives a revolving part (as a chuck or the spindle on a lathe)
The fixed or stationary end of a lathe or similar machine tool.
The assembly fixed on the left-hand end of the bed of the lathe which provides the drive for the workpiece.
The fixed or stationary end of a lathe or similar machine tool. 
noun the stationary support in a machine or power tool that supports and drives a revolving part (as a chuck or the spindle on a lathe)
The railway term for the buffer beam.