pileous /ˈpɪliəs/ adjective2 •Of, pertaining to, or consisting of hair.Another frequent affection of the labia majora, is vulvular folliculitis of Hulguier, that is to say the inflammatlon of the numerous pileous and sebaceous glands of this organ. — 1861 •Covered with hair; hairy.This rare species might, but for the rugose and pileous epidermis and more depressed form, readily be confounded with the preceding. — 1861 formsmore pileous · most pileous