What is the meaning of the word "jackscrew"?

Definitions:

  1. A jack in which a large screw is used for lifting or exerting pressure. copy to clipboard NOUN
    • The old bridge was raised with the help of multiple jackscrews to replace its supports. copy to clipboard
  2. A jack which is operated by a turning a leadscrew. copy to clipboard NOUN
    • Jackscrews are essential tools in heavy machinery maintenance for lifting and supporting large components. copy to clipboard
  3. A mechanical device that uses a threaded screw to lift or apply pressure. copy to clipboard NOUN
    • The technician used a jackscrew to lift the heavy machinery for maintenance. copy to clipboard

Synonyms: