👉 Ferruginous, a type of pigment found in the skin and mucous membranes of some animals. It's also known as ferruginous matter or ferruginous pigments. The term "ferruginine" is derived from the Greek word "ferinus," meaning black (or dark), indicating that it is an iron oxide pigment commonly found in animal waste or urine, which can be used to produce a distinctive color on the skin of animals. In veterinary medicine and pathology, ferr
