Covered with or containing mold, a fuzzy fungus that grows on damp food or surfaces.
From Middle English 'mouly' and possibly Old Norse origins, meaning 'dusty' or 'crumbly.' The spelling 'mouldy' is British English; Americans spell it 'moldy.' The word dates back to at least the 14th century.
Mouldy cheese like Roquefort and blue cheese are actually prized delicacies—they have beneficial molds that create unique flavors, showing how the same fungus can be disgusting on bread but delicious when controlled on cheese.
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