noun jack·stay \ˈjak-ˌstā\

Definition of jackstay

  1. 1 :  an iron rod, wooden bar, or wire rope along a yard of a ship to which the sails are fastened

  2. 2 :  a support of wood, iron, or rope running up a mast on which the parrel of a yard travels

Circa 1840

First Known Use of jackstay

circa 1840

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