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.
Compound of 海蛇 (umihebi, 'sea snake') + 座 (za, 'constellation'), a direct translation of the Latin name Hydra.