1. Thick, stiff paper.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• posterboard,
• oasteboard,
• lasteboard,
• -asteboard,
• 0asteboard,
• pzsteboard,
• pssteboard,
• pwsteboard,
• pqsteboard,
• paateboard,
• pazteboard,
• plasteboard,
• pastboard,
• pastebord,
• paste board,
• passegard,
• wasteboared,
• wasteboord,
• plasteboards,
• putteboard

The adjective form of the word "pasteboard" is "pasteboard". The word functions as both a noun and an adjective, describing something made of or resembling a stiff, thin material used for making boxes or as backing for pads of paper.

The plural of the "pasteboard" can be the "pasteboards".

The singular of the "pasteboard" can be the "pasteboard".