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Definition of jackscrew : A jack in which a screw is used for lifting, or exerting pressure. See Illust. of 2d Jack, n., 5.

Synonyms:

screw jack

Usage examples:

• The Governor’ s lady enlivened the tedious voyage over by telling of several little incidents that had occurred; one was when the Mayflower during a severe storm was saved from going to the bottom by some one wedging a kracht, or jackscrew, in a leak that had suddenly sprung amidships. - "Blue Robin, the Girl Pioneer", Rena I. Halsey.