• A jack operated by a screw.
  • See <internalXref urlencoded="jack">jack</internalXref>, 11 .
  • The screw-mechanism forming part of a dental instrument called a <em>screw-jack</em> (which see), for regulating the teeth.
  • A jack in which a screw is used for lifting, or exerting pressure. See <ex>Illust.</ex> of 2d <xref urlencoded="jack">jack</xref>, n., 5.
  • A <xref>jack</xref> (mechanical lifting device) which is operated by turning a <xref>leadscrew</xref>.
  • screw-operated jack
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