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

While these changes are taking place the collateral arteries become enlarged, and an anastomotic circulation is established.
Manual of Surgery Alexis Thomson and Alexander Miles

noun (pl) -ses (-siːz)
a natural connection between two tubular structures, such as blood vessels
the surgical union of two hollow organs or parts that are normally separate
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.

anastomosis a·nas·to·mo·sis (ə-nās’tə-mō’sĭs)
n. pl. a·nas·to·mo·ses (-sēz)

The direct or indirect connection of separate parts of a branching system to form a network, especially among blood vessels.

The surgical connection of separate or severed tubular hollow organs to form a continuous channel as between two parts of the intestine.

An opening created by surgery, trauma, or disease between two or more normally separate spaces or organs.

a·nas’to·mot’ic (-mŏt’ĭk) adj.


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