Hercules

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Greek & Roman Mythology The son of Zeus and Alcmene, a hero of extraordinary strength who won immortality by performing 12 labors demanded by the Argive king Eurystheus.
• noun A constellation in the Northern Hemisphere near Lyra and Corona Borealis.

from The Century Dictionary.

• noun In Greek and Roman mythology, a mighty hero, originating in Greek legend, but adopted by the Romans, and worshiped as the god of physical strength, Courage, and related qualities.
• noun One of the ancient constellations, between Lyra and Corona Borealis, representing a man upon one knee, with his head toward the south, and with uplifted arms.
• noun A form of drop-hammer. See the extract.
• noun Same as Hercules-beetle.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Gr. Myth.) A hero, fabled to have been the son of Jupiter and Alcmena, and celebrated for great strength, esp. for the accomplishment of his twelve great tasks or “labors.”
• noun (Astron.) A constellation in the northern hemisphere, near Lyra.
• noun (Zoöl.) any species of Dynastes, an American genus of very large lamellicorn beetles, esp. Dynastes hercules of South America, which grows to a length of six inches.
• noun an explosive containing nitroglycerin; -- used for blasting.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun Greek mythology Son of Jupiter and Alcmene, a celebrated hero who possessed exceptional strength. Most famous for his 12 labors performed to redeem himself after killing his family.
• proper noun astronomy A summer constellation of the northern sky, said to resemble the mythical hero. It lies between the constellations Lyra and Corona Borealis.
• proper noun astronomy A crater in the first quadrant on the moon.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (classical mythology) a hero noted for his strength; performed 12 immense labors to gain immortality
• noun a large constellation in the northern hemisphere between Lyra and Corona Borealis