n 1  :  any of several skin diseases characterized by the eruption of flat papules : esp  :  LICHEN PLANUS  2  :  any of numerous complex thallophytic plants (group Lichenes) made up of an alga and a fungus growing in symbiotic association on a solid surface (as a rock) .
 
 
 
Similar sounding terms:  L chain   lesion  lo·tion 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.