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lichen

noun
🔊/ˈlaɪkən/, 🔊/ˈlɪtʃən/
🔊/ˈlaɪkən/, 🔊/ˈlɪtʃən/
[uncountable, countable]
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  1. a very small grey or yellow plant that spreads over the surface of rocks, walls and trees and does not have any flowers地衣
     compare moss
    Word Originearly 17th cent.: via Latin from Greek leikhēn.