The term 'Black-and-White Medium' refers to a type of art medium that uses only black and white colors. One example of this type of medium is CHARCOAL, which is an 8-letter word. CHARCOAL is a dark gray or black form of carbon that is produced by burning wood or other organic materials in the absence of oxygen. It is commonly used in drawing and painting, as it can create a wide range of tones and textures.