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



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 Originearly 17th cent.: via Latin from Greek leikhēn.
See the Oxford Advanced American Dictionary entry: lichen