In the kidney, there are many small spherical structures called "glomeruli" in which tiny arteries and the beginning of the urine collecting tubules are intmately in contact, to allow waste products to pass from blood into the urine.

I am still puzzled why the Labyrinth legend did not bring into English a word from one of these two roots.

For an interesting site about beginnings of etymology see this URL:
http://www.uni-ulm.de/uni/intgruppen/memosys/cunni06.htm

You can't blame me for the anatomically explicit symbol at the beginning.