'Tailstock' definitions:

Definition of 'tailstock'

(from WordNet)
noun
Support consisting of the movable part of a lathe that slides along the bed in alignment with the headstock and is locked into position to support the free end of the workpiece

Definition of 'Tailstock'

From: GCIDE
  • Tailstock \Tail"stock`\, n. The sliding block or support, in a lathe, which carries the dead spindle, or adjustable center. The headstock supports the live spindle. [1913 Webster]