'Jackscrew' definitions:

Definition of 'jackscrew'

From: WordNet
noun
Screw-operated jack [syn: jackscrew, screw jack]

Definition of 'Jackscrew'

From: GCIDE
  • Jackscrew \Jack"screw`\, n. A jack in which a screw is used for lifting, or exerting pressure. See Illust. of 2d Jack, n., 5. [1913 Webster]