Deucalion (dū-kā′li-on), the hero of the Greek story of the flood. He was the son of Prometheus and the husband of Pyrrha. When Zeus had decided to destroy the race of men by a flood, Deucalion built an ark or ship, in which he and his wife floated during the nine days' flood which drowned all the other people of Greece. On the going down of the waters, the ark rested on Mount Parnassus. To repeople the world, Deucalion and Pyrrha were told by the goddess Themis to throw behind them the bones of their mother. This they did with the stones of mother-earth, and from those thrown by Deucalion, so the story goes, sprang up men, and from those thrown by Pyrrha sprang up women.