Source : Webster's Revised Unabridged Dictionary (1913)

Pasteboard \Paste"board`\, n.
   1. A stiff thick kind of paper board, formed of several
      single sheets pasted one upon another, or of paper
      macerated and pressed into molds, etc.

   2. (Cookery) A board on which pastry dough is rolled; a
      molding board.

Source : WordNet®

pasteboard
     n : stiff cardboard made by pasting together layers of paper