Juno

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

• noun The principal goddess of the pantheon and the wife of Jupiter, worshiped as the goddess of women, marriage, childbirth, and the moon, and as the protector of the state. She came to be identified with the Greek Hera.

from The Century Dictionary.

• noun In Rom, mythology, the queen of heaven, the highest divinity of the Latin races in Italy next to Jupiter, of whom she was the sister and the wife.
• noun The third planetoid, discovered by Harding, at Lilienthal, in 1804.

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

• noun (Rom. Myth.) The queen of the Olympian gods, the sister and wife of Jupiter, and the goddess who presided over marriage. She corresponds to the Greek Hera.
• noun (Astron.) One of the early discovered asteroids.
• noun the peacock.

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

• proper noun Roman mythology The queen of the gods, equivalent of the Greek Hera.
• proper noun astronomy The third asteroid discovered.

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

• noun (Roman mythology) queen of the Olympian gods who protected marriage; wife and sister of Jupiter; counterpart of Greek Hera