1) Art material 
Bristol board (also referred to as Bristol paper or Super white paper) is an uncoated, machine-finished paperboard. It is named after the city of Bristol in the southwest of England. Common sizes include 22.5″ × 28.5″ (572 × 724 mm) and its bulk thickness is .006 inches (0.15 mm) or higher and A4, A3, A2 and A1 Bristol board may be rated by ...
A fine board made in various qualities for illustration.
A stiff durable ply-produced cardboard suitable for pen and ink work or water-colour and gouache.
Bristol board is a type of stiff drawing paper, smooth and sometimes glazed, originally made in Bristol hence its name.
A fine quality paperboard which may be made solid by pasting two or more sheets together.
A board paper of various thickness; having a smooth finish and used for printing and drawing.
a fine, smooth pasteboard that is sometimes glazed.