jury mast

from WordNet (r) 3.0 (2006)

jury mast
    n 1: a temporary mast to replace one that has broken off

from The Collaborative International Dictionary of English v.0.48

Jury mast \Ju"ry mast\
   (a) A temporary mast, in place of one that has been carried
       away, or broken.
   (b) (Med.) An apparatus to support the trunk and head in
       spinal disease.
       [Webster 1913 Suppl.]