Hydrus
/ˈhaɪdrəs/1
- Astronomy an inconspicuous southern constellation (the Water Snake), between the star Achernar and the south celestial pole【天文】水蛇星座。比较HYDRA（义项2）。
1.1
- as genitive Hydri /-drʌɪ/ 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水蛇星座的：
the star Delta Hydri.
水蛇座δ星。
词源
Latin, from Greek hudros.