regrow
    v 1: grow anew or continue growth after an injury or
         interruption; "parts of the trunk of this tree can regrow";
         "some invertebrates can regrow limbs or their tail after
         they lost it due to an injury"

Regrow \Re*grow"\ (r?*gr?"), v. i. & t.
   To grow again.
   [1913 Webster]

         The snail had power to regrow them all [horns, tongue,
         etc.]                                    --A. B.
                                                  Buckley.
   [1913 Webster]