lichen: Meaning and Definition of
Pronunciation: (lī'kun), [key]
- 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.
- any of various eruptive skin diseases.
- to cover with or as if with lichens.
- lichen (Thesaurus)