Etymology
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lichen (n.)

1715, from Latin lichen, from Greek leichen "tree-moss, lichen," originally "what eats around itself," probably from leichein "to lick" (from PIE root *leigh- "to lick"). Used earlier (c. 1600) of liverwort, which was thought to be related. Also in English, as in Greek, of eczema and certain other skin diseases. Related: Lichenic; licheniform; lichenous; lichenaceous.

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Definitions of lichen

lichen (n.)
any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks;
lichen (n.)
any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.;
From wordnet.princeton.edu