toner /ˈtoʊnɚ/ noun4 •Powder used in laser printers and photocopiers to form the text and images on the printed paper.The printer needs more black toner. •Cosmetic lotion designed to cleanse the skin and shrink pores, usually used on the face.She applied a facial toner after washing her skin. •A hair product used to reduce brassiness and increase shine in bleached and dyed hair. •(dialect, no longer used) A musician, particularly one who plays a wind instrument. formstoners