78%RatingSave Gender Feminine Usage Astronomy, Greek Mythology Scripts Ὕδρα(Ancient Greek) Pronounced Pron. /ˈhaɪ̯.dɹə/(English) [key·simplify] Meaning & History Means "water serpent" in Greek, related to ὕδωρ (hydor) meaning "water". In Greek myth this was the name of a many-headed Lernaean serpent slain by Herakles. It is also the name of a northern constellation, as well as a moon of Pluto. Categories album titles, Ancient Greek words, astronomy, constellations, isograms, legendary creatures, monsters, moons, mythical creatures, reptiles, snakes, water