The Collaborative International Dictionary of English v.0.48:

Papier-mach'e \Pa`pier"-ma`ch['e]"\, n. [F. papier m[^a]ch['e],
   lit., chewed or mashed paper.]
   A hard and strong substance made of a pulp from paper, mixed
   with size or glue, etc. It is formed into various articles,
   usually by means of molds.
   [1913 Webster]

WordNet (r) 3.0 (2006):

papier-mache
    n 1: a substance made from paper pulp that can be molded when
         wet and painted when dry [syn: papier-mache, paper-
         mache]