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

 

lichen

 noun
noun
BrE BrE//ˈlaɪkən//
 
; NAmE NAmE//ˈlaɪkən//
 
; BrE BrE//ˈlɪtʃən//
 
; NAmE NAmE//ˈlɪtʃən//
 
[uncountable, countable]
 
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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 Word Origin early 17th cent.: via Latin from Greek leikhēn.
See the Oxford Advanced American Dictionary entry: lichen