lichen 音标拼音: [l'ɑɪkən]
n . 青苔,地衣,苔藓
青苔,地衣,苔藓
lichen n 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 .
Lichen \
Li "
chen \ (
l [
imac ]"
k [
e ^]
n ;
277 ),
n . [
L .,
fr .
Gr .
leichh `
n .]
1 . (
Bot .)
One of a class of cellular ,
flowerless plants ,
(
technically called {
Lichenes }),
having no distinction of leaf and stem ,
usually of scaly ,
expanded ,
frond -
like forms ,
but sometimes erect or pendulous and variously branched .
They derive their nourishment from the air ,
and generate by means of spores .
The species are very widely distributed ,
and form irregular spots or patches ,
usually of a greenish or yellowish color ,
upon rocks ,
trees ,
and various bodies ,
to which they adhere with great tenacity .
They are often improperly called {
rock moss }
or {
tree moss }.
[
1913 Webster ]
Note :
A favorite modern theory of lichens (
called after its inventor the Schwendener hypothesis ),
is that they are not autonomous plants ,
but that they consist of ascigerous fungi ,
parasitic on alg [
ae ].
Each lichen is composed of white filaments and green ,
or greenish ,
rounded cells ,
and it is argued that the two are of different nature ,
the one living at the expense of the other .
See {
Hyph [
ae ]},
and {
Gonidia }.
[
1913 Webster ]
2 . (
Med .)
A name given to several varieties of skin disease ,
esp .
to one characterized by the eruption of small ,
conical or flat ,
reddish pimples ,
which ,
if unchecked ,
tend to spread and produce great and even fatal exhaustion .
[
1913 Webster ]
88 Moby Thesaurus words for "
lichen ":
acne ,
acne vulgaris ,
algae ,
autophyte ,
bean ,
bracken ,
brown algae ,
climber ,
conferva ,
confervoid ,
creeper ,
dermamycosis ,
dermatitis ,
dermatosis ,
diatom ,
eczema ,
elephantiasis ,
epithelioma ,
erysipelas ,
erythema ,
exanthem ,
fern ,
fruits and vegetables ,
fucus ,
fungus ,
grapevine ,
green algae ,
gulfweed ,
heat rash ,
herb ,
herpes ,
herpes simplex ,
herpes zoster ,
heterophyte ,
hives ,
impetigo ,
itch ,
ivy ,
jungle rot ,
kelp ,
legume ,
lentil ,
leprosy ,
liana ,
lichen primus ,
liverwort ,
lupus ,
lupus vulgaris ,
miliaria ,
mold ,
moss ,
mushroom ,
parasite ,
parasitic plant ,
pea ,
pemphigus ,
perthophyte ,
phytoplankton ,
planktonic algae ,
plant families ,
prickly heat ,
pruigo ,
pruritus ,
psora ,
puffball ,
pulse ,
red algae ,
ringworm ,
rockweed ,
rust ,
saprophyte ,
sargasso ,
sargassum ,
scabies ,
sea lentil ,
sea moss ,
sea wrack ,
seaweed ,
shingles ,
skin cancer ,
smut ,
succulent ,
tetter ,
toadstool ,
vetch ,
vine ,
wort ,
wrack
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