Dictionary:

anastomose

  (ə-năs'tə-mōz', -mōs')

Also from Answers.com... Osteoporosis Ways to prevent brittle bones.

To join by anastomosis.

To be connected by anastomosis, as blood vessels.

[Back-formation from ANASTOMOSIS.]

1. To join by anastomosis.
2. To be connected by anastomosis.

The verb has 2 meanings:

Meaning #1: come together or open into each other, as of blood vessels
  Synonym: inosculate

Meaning #2: cause to join or open into each other by anastomosis, as of blood vessels
  Synonym: inosculate