noun, plural a·nas·to·mo·ses [uh-nas-tuhmoh-seez] /əˌnæs təˈmoʊ siz/.

  1. Anatomy. communication between blood vessels by means of collateral channels, especially when usual routes are obstructed.
  2. Biology, Geology. connection between parts of any branching system, as veinlets in a leaf or branches of a stream.
  3. Surgery, Pathology. a joining of or opening between two organs or spaces that normally are not connected.

noun plural -ses (-siːz)

  1. a natural connection between two tubular structures, such as blood vessels
  2. the surgical union of two hollow organs or parts that are normally separate
  3. the separation and rejoining in a reticulate pattern of the veins of a leaf or of branches

1610s, medical or Modern Latin, from Greek anastomosis “outlet, opening,” from anastomoein “to furnish with a mouth,” from stoma “mouth” (see stoma). Related: Anastomotic.

n. pl. a•nas•to•mo•ses (-sēz)

  1. The direct or indirect connection of separate parts of a branching system to form a network, especially among blood vessels.
  2. The surgical connection of separate or severed tubular hollow organs to form a continuous channel as between two parts of the intestine.
  3. An opening created by surgery, trauma, or disease between two or more normally separate spaces or organs.
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