Before the passage, horrid Hydra stands, And Briareus with all his hundred hands; Gorgons, Geryon with his triple frame; And vain Chimaera vomits empty flame.
More formidable Hydra stands within, Whose jaws with iron teeth severely grin.
Proud of his steeds, he smokes along the field; His father’s hydra fills his ample shield: A hundred serpents hiss about the brims; The son of Hercules he justly seems By his broad shoulders and gigantic limbs; Of heav’nly part, and part of earthly blood, A mortal woman mixing with a god.
There are no more uses of "Hydra" in the book.
Show samples from other sources
The Hydra’s heads would only stop multiplying if we burned the stumps before they regrew.
Rick Riordan -- The Sea of Monsters
They were blackened and caved, mouths agape, eyes boiled shut, melted and pooled together in the gutter like some hydra-headed horror.