Noun
A net or network; a plexus; particularly, a network of blood vessels or nerves, or a part resembling a network.
Source: Webster's dictionaryIn these sharks, a strip of aerobic red muscle located near the center of the body generates the heat, which the body retains via a countercurrent exchange mechanism by a system of blood vessels called the rete mirabile ("miraculous net"). Source: Internet
One of these adaptations is a " rete mirabile " (Latin for "wonderful net"). Source: Internet