名詞 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
   同義詞：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.
   巨爵座南天球的一個星座，位于長蛇座和烏鴉座附近

hy.dra

n.（名詞）
【復(fù)數(shù)】 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：任何幾種水螅 屬或相近屬的小型的、淡水珊瑚蟲，身體呈圓柱形、表面無鱗甲，口部周圍有觸須

來源：
New Latin Hydra [genus name]
現(xiàn)代拉丁語 Hydra [屬的名稱]
from Latin Hydra [Hydra] * see Hydra
源自 拉丁語 Hydra [水螅] *參見 Hydra