Source : Webster's Revised Unabridged Dictionary (1913)

Blotting paper \Blot"ting pa`per\ (p[=a]`p[~e]r).
   A kind of thick, bibulous, unsized paper, used to absorb
   superfluous ink from freshly written manuscript, and thus
   prevent blots.

Source : WordNet®

blotting paper
     n : absorbent paper used to dry ink [syn: {blotter}]