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.
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
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.
[1913 Webster] Molder