Hidra

Proper noun

 * 1)  Hydra seven-headed serpent slain by Hercules
 * 2)  Hydra constellation
 * 3)  Hydra one of Pluto's moons
 * 1)  Hydra one of Pluto's moons

Proper noun

 * 1)  Hydra one of Pluto's moons
 * 2)  Hydra