lichen

名词 lichen:

1. any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks
2. any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.

1. The rock is full of lichen.
   岩石上长满了青苔。

li.chen

n.（名词）
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.
地衣：一种真菌类植物，通常属于子囊菌纲，与藻共生形成一种复合有机体，生长于岩石或树干上，多为硬壳状或枝叉状
Pathology Any of various skin diseases characterized by patchy eruptions of small, firm papules.
【病理学】 苔藓病：一种皮肤病，以出现斑状的小而硬的丘疹为特征
v.tr.（及物动词）
li.chened,li.chen.ing,li.chens
To cover with lichens.
用地衣覆盖

来源：
Latin lochôn [a kind of plant]
拉丁语 lochôn [一种植物]
from Greek leikhôn
源自 希腊语 leikhôn
from leikhein [to lick] * see leigh-
源自 leikhein [舔] *参见 leigh-

【引伸】
li.chenous
adj.（形容词）