lichen
noun
- any of various small plants composed of a particular fungus and a particular alga growing in an intimate symbiotic association and forming a dual plant, commonly adhering in colored patches or spongelike branches to rock, wood, soil, etc.
- any of various skin diseases characterized by papules and enlarged skin markings
transitive verb
to cover with lichens
See lichen in American Heritage Dictionary 4
(līˈkən)
noun- A fungus, usually of the class Ascomycetes, that grows symbiotically with algae, resulting in a composite organism that characteristically forms a crustlike or branching growth on rocks or tree trunks.
- Pathology Any of various skin diseases characterized by patchy eruptions of small, firm papules.
transitive verb li·chened,
li·chen·ing,
li·chens To cover with lichens.
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