Source : Webster's Revised Unabridged Dictionary (1913)

Moldy \Mold"y\, Mouldy \Mould"y\, a. [Compar. {Moldier}or
   {Mouldier}; superl. {Moldiest} or {Mouldiest}.] [From {Mold}
   the growth of fungi.]
   Overgrown with, or containing, mold; as, moldy cheese or
   bread.

Mould \Mould\ (m[=o]ld), Moulder \Mould"er\, Mouldy \Mould"y\,
   etc.
   See {Mold}, {Molder}, {Moldy}, etc.

Source : WordNet®

mouldy
     adj : covered with or smelling of mold; "moldy bread"; "a moldy
           (or musty) odor" [syn: {moldy}, {musty}]
     [also: {mouldiest}, {mouldier}]