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English definition of “mould”

mould

noun [U] (SUBSTANCE) UK (US mold)     /məʊld/ US  /moʊld/
a soft , green or grey growth that develops on old food or on objects that have been left for too long in warm , wet air : There was mould on the cheese .Bacteria, moulds, germs and viruses
(Definition of mould noun (SUBSTANCE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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