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English definition of “fungus”

fungus

noun [C or U]     /ˈfʌŋ.ɡəs/ (plural fungi   /-ɡaɪ/   or funguses)
any of various types of organism that get their food from decaying material or other living things: Mushrooms and mould are fungi. Fungus can be poisonous.Bacteria, moulds, germs and viruses
(Definition of fungus noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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