Jury-mast

Webster's Condensed Dictionary- A Condensed Dictionary of the English Language · 1909 · p. 323

ju'rr-mast. n. (3T A temporary mast erected in a ship, to supply the place of one carried away. [Perh. fr. Dan. kiore. a driving, kiore. Ic. keyra, to drive, — a thing by which a ship is driven: prob. not for injury-mast,]