The Collaborative International Dictionary of English v.0.48:

Ingraft \In*graft"\, v. t. [imp. & p. p. Ingrafted; p. pr. &
   vb. n. Ingrafting.] [Written also engraft.]
   [1913 Webster]
   1. To insert, as a scion of one tree, shrub, or plant in
      another for propagation; as, to ingraft a peach scion on a
      plum tree; [figuratively], to insert or introduce in such
      a way as to make a part of something.
      [1913 Webster]

            This fellow would ingraft a foreign name
            Upon our stock.                       --Dryden.
      [1913 Webster]

            A custom . . . ingrafted into the monarchy of Rome.
                                                  --Burke.
      [1913 Webster]

   2. To subject to the process of grafting; to furnish with
      grafts or scions; to graft; as, to ingraft a tree.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ingraft
    v 1: cause to grow together parts from different plants; "graft
         the cherry tree branch onto the plum tree" [syn: graft,
         engraft, ingraft]