Definitions for jackscrew
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Princeton's WordNet
jackscrew, screw jack(noun)
screw-operated jack
Wiktionary
jackscrew(Noun)
A jack (mechanical lifting device) which is operated by turning a leadscrew.
Webster Dictionary
Jackscrew(noun)
a jack in which a screw is used for lifting, or exerting pressure. See Illust. of 2d Jack, n., 5
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"jackscrew." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/jackscrew>.

