anastomosis

noun4

1. •
   A cross-connection between two blood vessels.
2. •
   The surgical creation of a connecting passage between blood vessels, bowels or other channels.
3. •
   An interconnection between any two channels, passages or vessels.

   • (...) our grandam, which we are linked up with by successive anastomosis of navelcords sold us all, seed, breed and generation, for a penny pippin. — 1922
4. •
   The insertion of one word within another, as in "underdarkneath" (James Joyce).