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English definition of “lichen”


noun [C or U]     /ˈlaɪ.kən/ /ˈlɪtʃ.ən/
a grey, green, or yellow plant-like organism that grows on rocks, walls, and treesBacteria, moulds, germs and virusesCommon plants
(Definition of lichen noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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