(līʹkən) (līʹkən) noun. liken
1. 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.
2. Pathology. Any of various skin diseases characterized by patchy eruptions of small, firm papules.
To cover with lichens.
[Latin līchēn, a kind of plant, from Greek leikhēn, from leikhein, to lick.]
acid asid likenik
The branch of biology that deals with the study of lichens. likenologi. —