hair, haired, hairless, hairlessness 1. Any of the cylindrical filaments characteristically growing from the epidermis of a mammal. 2. Any of the numerous fine, usually cylindrical, keratinous filaments growing from the skin of humans and animals; a pilus. 3. An aggregate of such filaments, as that covering the human head or forming the coat of mo... Found on http://www.wordinfo.info/words/index/info/view_unit/2179/2