hydra

名词 hydra:

1. (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones
2. a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
   同义词：Snake
3. trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality
4. small tubular solitary freshwater hydrozoan polyp

1. A constellation in the Southern Hemisphere near Hydra and Corvus.
   巨爵座南天球的一个星座，位于长蛇座和乌鸦座附近

hy.dra

n.（名词）
【复数】 hy.dras 或 hy.drae [-drô]
Any of several small freshwater polyps of the genusHydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.
水螅：任何几种水螅 属或相近属的小型的、淡水珊瑚虫，身体呈圆柱形、表面无鳞甲，口部周围有触须

来源：
New Latin Hydra [genus name]
现代拉丁语 Hydra [属的名称]
from Latin Hydra [Hydra] * see Hydra
源自 拉丁语 Hydra [水螅] *参见 Hydra