The term IT MAY HAVE A PART is a crossword solution for the word HAIR. HAIR is a filamentous biomaterial that grows from follicles found in the dermis of mammals. It is one of the defining characteristics of mammals, and is most commonly found on humans. HAIR can also be found on other animals, such as cats, dogs, horses, and many more. HAIR serves many purposes, including protection from the elements, insulation, and even communication.