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]

Moby Thesaurus II by Grady Ward, 1.0:

92 Moby Thesaurus words for "molder":
   ablate, age, antiquate, atomize, become extinct, become obsolete,
   break down, break up, calm, calm down, canker, carver, cease,
   chaser, clay modeler, come apart, consume, corrode, corrupt,
   crack up, crumble, crumble into dust, date, decay, decompose,
   die down, disintegrate, disjoin, disorganize, dissolve, dwindle,
   earth artist, ebb, erode, fade, fall into decay, fall to pieces,
   fester, figurer, figuriste, fission, fossilize, fust, gangrene,
   gem carver, go bad, go to pieces, graver, grow old, halt,
   lose currency, lull, mason, mildew, modeler, mold,
   monumental mason, mortify, necrose, obsolesce, outdate, pacify,
   perish, putrefy, putresce, quiesce, quiet, quieten, rankle, rot,
   rust, sculptor, sculptress, sculpturer, soothe, sphacelate, split,
   spoil, statuary, stonecutter, stop, subside, superannuate,
   suppurate, taint, tranquilize, turn, wane, waste away, wax modeler,
   wear away, wood carver