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Definition of lichen noun from the Oxford Advanced Learner's Dictionary

lichen

noun
lichen pronunciation English ˈlaɪkən lichen pronunciation American ˈlaɪkən
lichen pronunciation English ˈlɪtʃən lichen pronunciation American ˈlɪtʃən
[uncountable, countable]
 
a very small grey or yellow plant that spreads over the surface of rocks, walls and trees and does not have any flowers
compare moss