Pheomelanic refers to a type of pigmentation in animals or humans that produces a reddish-brown color. Some synonyms for pheomelanic include chestnut, rust-colored, ginger, auburn, and cinnamon-colored. These terms describe the same type of pigmentation seen in animals such as horses, cattle, and dogs, as well as in humans. Pheomelanic skin, hair, and fur is caused by the presence of the pigment pheomelanin, which is a type of melanin that gives a reddish-brown appearance. Although pheomelanic pigmentation is less common than eumelanin, which is a black or brown pigment, it is still found in many species and can be a defining characteristic of certain breeds or types of animals.