Anastomosis (OED): Intercommunication between two vessels, channels, or distinct branches of any kind, by a connecting cross branch. Applied originally to the cross communications between the arteries and veins, or other canals in the animal body; whence to similar cross connexions in the sap-vessels of plants, and between rivers or their branches; and now to CROSS CONNEXIONS BETWEEN THE SEPARATE LINES OF ANY BRANCHING SYSTEM...