The Collaborative International Dictionary of English v.0.48:

Moule \Moule\ (m[=o]l), v. i. [OE. moulen. See Mold.]
   To contract mold; to grow moldy; to mold. [Obs.]
   [1913 Webster]

         Let us not moulen thus in idleness.      --Chaucer.
   [1913 Webster] Mouline