Lichen (noun) Definition, Meaning & Examples

noun
  1. any complex organism of the group Lichenes, composed of a fungus in symbiotic union with an alga and having a greenish, gray, yellow, brown, or blackish thallus that grows in leaflike, crustlike, or branching forms on rocks, trees, etc.
  2. any of various eruptive skin diseases.
verb (used with object)
  1. to cover with or as if with lichens.
noun
  1. an organism that is formed by the symbiotic association of a fungus and an alga or cyanobacterium and occurs as crusty patches or bushy growths on tree trunks, bare ground, etc. Lichens are now classified as a phylum of fungi (Mycophycophyta)
  2. any of various eruptive disorders of the skin
    Lichen (noun) Definition, Meaning & Examples

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