The Collaborative International Dictionary of English v.0.48:

Continuer \Con*tin"u*er\, n.
   One who continues; one who has the power of perseverance or
   persistence. "Indulgent continuers in sin." --Hammond.
   [1913 Webster]

         I would my horse had the speed of your tongue, and so
         good a continuer.                        --Shak.
   [1913 Webster]