The Collaborative International Dictionary of English v.0.48:

Molder \Mold"er\, Moulder \Mould"er\, n.
   One who, or that which, molds or forms into shape;
   specifically (Founding), one skilled in the art of making
   molds for castings.
   [1913 Webster] Molder

The Collaborative International Dictionary of English v.0.48:

Molder \Mold"er\, Moulder \Mould"er\, v. i. [imp. & p. p.
   Molderedor Mouldered; p. pr. & vb. n. Moldering or
   Mouldering.] [From Mold fine soft earth: cf. Prov. G.
   multern.]
   To crumble into small particles; to turn to dust by natural
   decay; to lose form, or waste away, by a gradual separation
   of the component particles, without the presence of water; to
   crumble away.
   [1913 Webster]

         The moldering of earth in frosts and sun. --Bacon.
   [1913 Webster]

         When statues molder, and when arches fall. --Prior.
   [1913 Webster]

         If he had sat still, the enemy's army would have
         moldered to nothing.                     --Clarendon.
   [1913 Webster] Molder

The Collaborative International Dictionary of English v.0.48:

Molder \Mold"er\, Moulder \Mould"er\, v. t.
   To turn to dust; to cause to crumble; to cause to waste away.
   [1913 Webster]

         [Time's] gradual touch
         Has moldered into beauty many a tower.   --Mason.
   [1913 Webster] Moldery

WordNet (r) 3.0 (2006):

molder
    v 1: break down; "The bodies decomposed in the heat" [syn:
         decompose, rot, molder, moulder]