jackscrew Hear it!

jackscrew definition

jack·screw (jak′skro̵̅o̅′)

noun

a machine used to raise heavy things a short distance, operated by turning a screwlike shaft

Etymology: jack- + screw

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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