The Collaborative International Dictionary of English v.0.48:

Rejoint \Re*joint"\ (r[-e]-joint"), v. t.
   1. To reunite the joints of; to joint anew. --Barrow.
      [1913 Webster]

   2. Specifically (Arch.), to fill up the joints of, as stones
      in buildings when the mortar has been dislodged by age and
      the action of the weather. --Gwilt.
      [1913 Webster]