Pronunciation: (hûr'kyu-lēz"),[key] —n., —gen.-cu•lisPronunciation: (-kyu-lis)[key]for 2. 1. Also,Heracles.Also called Alcides.Class. Myth.a celebrated hero, the son of Zeus and Alcmene, possessing exceptional strength: among his many adventures were the twelve labors for his cousin Eurystheus, performed in order to gain immortality. Cf. labors of Hercules. 2. Astron.a northern constellation, between Lyra and Corona Borealis.