Lichen

//ˈlaɪ.kən// noun, verb

Definitions

Noun
  1. 1
    Any of many symbiotic organisms, being associations of algae and fungi, often found as white or yellow-to-blue–green patches on rocks, old walls, etc. countable, uncountable

    "The Beaches of Lukannon–the winter wheat so tall, / The dripping, crinkled lichens, and the sea-fog drenching all!"

  2. 2
    any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc. wordnet
  3. 3
    Something which gradually spreads across something else, causing damage. countable, figuratively, uncountable

    "Meanwhile, abiding a day of judgment, she fought ceaselessly to deny the bitter drops in her cup, to tear back the slow, the intangibly slow growth of a hot, corrosive lichen eating into her heart."

  4. 4
    any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks wordnet
Verb
  1. 1
    To cover with lichen. transitive

    "[…] making the rocks assume the mould of age and lichening the trees with damp beauty."

Etymology

Etymology 1

Borrowed from Latin līchēn, from Ancient Greek λειχήν (leikhḗn), from λείχω (leíkhō, “to lick”). Originally used of liverwort; the modern sense first recorded 1715.

Etymology 2

Borrowed from Latin līchēn, from Ancient Greek λειχήν (leikhḗn), from λείχω (leíkhō, “to lick”). Originally used of liverwort; the modern sense first recorded 1715.

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