[ 'lʌɪk(ə)n , 'lɪtʃ(ə)n ]
■ noun
1》 a simple composite plant consisting of a fungus in association with an alga, typically growing on rocks, walls, and trees.
2》 a skin disease in which small, round, hard lesions occur close together.
Derivatives
~ed adjective
~ology noun
~ous adjective
Origin
C17: via L. from Gk leikhēn .