Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

mould

noun [U] (SUBSTANCE) UK (US mold)
 
 
/məʊld/ US  /moʊld/

Definition

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)
Focus on the pronunciation of mould