Hydra (constellation); the Sea Serpent
Astronomical term for the constellation Hydra, the largest constellation in the sky.
Hydra is the largest constellation in the entire sky.
Let's look for Hydra in the spring night sky.
Kanji spelling; less common but still used in astronomical contexts.
Compound of 海蛇 (umihebi, 'sea snake') + 座 (za, 'constellation'), a direct translation of the Latin name Hydra.