Hydra 音标拼音: [h'ɑɪdrə]
n . 九头蛇,难以根除之祸害,水蛇
九头蛇,难以根除之祸害,水蛇
Hydra n 1 : (
Greek mythology )
monster with nine heads ;
when struck off each head was replaced by two new ones ; "
Hydra was slain by Hercules "
2 :
a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer [
synonym :
{
Hydra }, {
Snake }]
3 :
trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality ; "
we may be facing a hydra that defies any easy solution "
4 :
small tubular solitary freshwater hydrozoan polyp Hydra \
Hy "
dra \,
n .;
pl .
E . {
Hydras },
L . {
Hydr [
ae ]}. [
L .
hydra ,
Gr . "
y `
dra ;
akin to "
y `
dwr water .
See {
Otter }
the animal ,
{
Water }.]
1 . (
Class .
Myth .)
A serpent or monster in the lake or marsh of Lerna ,
in the Peloponnesus ,
represented as having many heads ,
one of which ,
when cut off ,
was immediately succeeded by two others ,
unless the wound was cauterized .
It was slain by Hercules .
Hence ,
a terrible monster .
[
1913 Webster ]
Gorgons ,
and Hydras ,
and Chimeras dire . --
Milton .
[
1913 Webster ]
2 .
Hence :
A multifarious evil ,
or an evil having many sources ;
not to be overcome by a single effort .
[
1913 Webster ]
3 . (
Zool .)
Any small fresh -
water hydroid of the genus {
Hydra },
usually found attached to sticks ,
stones ,
etc .,
by a basal sucker .
[
1913 Webster ]
Note :
The body is a simple tube ,
having a mouth at one extremity ,
surrounded by a circle of tentacles with which it captures its prey .
Young hydras bud out from the sides of the older ones ,
but soon become detached and are then like their parent .
Hydras are remarkable for their power of repairing injuries ;
for if the body be divided in pieces ,
each piece will grow into a complete hydra ,
to which fact the name alludes .
The zooids or hydranths of marine hydroids are sometimes called hydras .
[
1913 Webster ]
4 . (
Astron .)
A southern constellation of great length lying southerly from Cancer ,
Leo ,
and Virgo .
[
1913 Webster ]
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