noun
Hydrus (constellation); the Water Snake
A small southern constellation; not to be confused with うみへび座 (Hydra).
水蛇座は南半球の小さな星座です。
Hydrus is a small constellation in the southern hemisphere.
Hydra, a much larger constellation; 水蛇座 (Hydrus) is distinct and less prominent.
From 水 (water) + 蛇 (snake) + 座 (constellation), a direct translation of the Latin name Hydrus.