Hydra
/ˈhaɪdrə/1
- Greek Mythology a many-headed snake whose heads grew again as they were cut off, killed by Hercules【希腊神话】九头蛇（头被砍掉后能再长出来, 被赫拉克勒斯杀死）。
1.1
- as noun hydra a thing which is hard to overcome or resist because of its pervasive or enduring quality or its many aspects难以根除的祸害, 大患; 难以抵制的事物。
2
- Astronomy the largest constellation (the Water Snake or Sea Monster), said to represent the beast slain by Hercules. Its few bright stars are close to the celestial equator【天文】长蛇星座。比较HYDRUS.
2.1
- as genitive Hydrae /-driː/ used with preceding letter or numeral to designate a star in this constellation与其前面的字母或数字连用以标记该星座中的星长蛇星座的：
the star Beta Hydrae.
长蛇座β星。
词源
via Latin from Greek hudra.