Definition
"Fistulous" describes something having the nature of a fistula. It means characterized by or pertaining to an abnormal passage or connection, especially between two internal organs or from an internal organ to the surface of the body. Think of it as describing something that *has* an unwanted tunnel ๐ณ๏ธ or channel where it shouldn't. It's closely related to the term "fistula" itself. Use is almost exclusively in medical and veterinary contexts.