\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.

\Mold"er\, Moulder \Mould"er\, v. i. [imp. & p. p.
{Moldered}or {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.
      The moldering of earth in frosts and sun. --Bacon.
      When statues molder, and when arches fall. --Prior.
      If he had sat still, the enemy's army would have
      moldered to nothing.                     --Clarendon.

\Mold"er\, Moulder \Mould"er\, v. t.
To turn to dust; to cause to crumble; to cause to waste away.
      [Time's] gradual touch Has moldered into beauty many a
      tower.                                   --Mason.