The Collaborative International Dictionary of English v.0.48:
Moldiness \Mold"i*ness\, Mouldiness \Mould"i*ness\, n. [From Moldy.] The state of being moldy. [1913 Webster] MoldingWordNet (r) 3.0 (2006):
moldiness n 1: the quality of smelling or tasting old or stale or mouldy [syn: mustiness, must, moldiness]