Apollo

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Greek Mythology The god of prophecy, music, medicine, and poetry, sometimes identified with the sun.
2. n. A young man of great physical beauty.

Century Dictionary and Cyclopedia

1. n. In Greek and later in Roman mythology, one of the great Olympian gods, the son of Zeus (Jupiter) and Leto (Latona), representing the light- and life-giving influence, as well as the deadly power, of the sun, and often identified with the sun-god, Helios. He was the leader of the Muses, god of music, poetry, and healing, and patron of these arts; a mighty protector from evil, all-seeing, and hence the master of prophecy; also the destroyer of the unjust and insolent, and ruler of pestilence. In art he was represented in the full majesty of youthful manhood, in most of his attributions unclothed or but lightly draped, and usually characterized by the bow and arrows, the laurel, the lyre, the oracular tripod, the serpent, or the dolphin. He was the father of Æsculapius, to whom he granted his art of healing. Apollo was honored, both locally and generally, under many special titles, of which each had its particular type in art and literature: as, Apollo Citharœdus (Apollo who sings to the accompaniment of the lyre), equivalent to Apollo Musagetes, the conductor of the Muses; Apollo Sauroctonos (the Lizard-killer), etc.
2. n. [lowercase] In entomology, a butterfly, Papilio apollo.

Wiktionary

1. n. astronomy An asteroid possessing an orbit that crosses the orbit of the Earth and an orbital period of over one year, with semimajor axes greater than 1 AU, and perihelion distances less than 1.017 AU.
2. n. astronomy The planet Mercury, when observed as a Morning Star.
3. n. A United States space program, and the vehicles it created, used for human travel to the moon.
4. n. with “the” Apollo Theater, a music hall in New York City associated with African-American performers.
5. n. A butterfly (Parnassius apollo, a large swallowtail with black and red spots on white wings).
6. n. A male given name.
7. n. A placename.

GNU Webster's 1913

1. n. (Classic Myth.) A deity among the Greeks and Romans. He was the god of light and day (the “sun god”), of archery, prophecy, medicine, poetry, and music, etc., and was represented as the model of manly grace and beauty; -- called also Phébus.

WordNet 3.0

1. n. (Greek mythology) Greek god of light; god of prophecy and poetry and music and healing; son of Zeus and Leto; twin brother of Artemis