headstock

noun6

1. •
   The part of a lute-type string instrument, such as a guitar, that holds the tuning pegs or tensioning screws of the strings.
2. •
   A part of a machine (such as a lathe or drill) that contains the primary spindle.
3. •
   A headframe.
4. •
   A transverse structural member at the extreme end of a rail vehicle's underframe, also used on some bogies.

   • The two-axle bogies, of Metro-Vick swing-link type, are of one-piece cast-steel construction with box-section side frames and headstocks. — 1960
5. •
   A beam that supports a bell.
6. •
   A clamp that restrains a cow by the neck.