Webster's English Dictionary

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hercules

Her.cu.les \'h*r-ky*-.le-z\ n [L, fr. Gk He-rakle-s] [L (gen. Herculis)] 1: 
   a hero of classical mythology noted for great strength and esp. for achi 
   eving twelve labors imposed on him by Hera 2: a northern constellation 
   between Corona Borealis and Lyra