the water-serpent killed by Hercules near the Lernean Lake , the Hydra , with seven heads; as fast as one of them was cut off two sprang up in its stead; . As identified with Echidna, the mother of Cerberus

http://lila-erc.eu/data/lexicalResources/LewisShort/id/LexicalSense/n21089.0 an entity of type: LexicalSense

the water-serpent killed by Hercules near the Lernean Lake , the Hydra , with seven heads; as fast as one of them was cut off two sprang up in its stead; . As identified with Echidna, the mother of Cerberus 
the water-serpent killed by Hercules near the Lernean Lake , the Hydra , with seven heads; as fast as one of them was cut off two sprang up in its stead; . As identified with Echidna, the mother of Cerberus 

data from the linked data cloud