n.[U]

1. 【植】地衣
   She struck the snow from the branches of an old cedar with gray lichen.

   她把長有灰色地衣的老雪松樹枝上的雪打了下來。

2. 【醫】苔蘚病
   I heard the ointment is effective for treating lichen.

   我聽說這軟膏治苔癬病有效。

vt.

1. 使長滿地衣
   After the construction, the field will be lichened.

   施工完後，將使地面長滿地衣。

n.

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.