The Collaborative International Dictionary of English v.0.48:

Apollo \A*pol"lo\, n. [L. Apollo, -linis, Gr. ?.] (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 Ph['e]bus.
   [1913 Webster]

   The Apollo Belvedere, a celebrated statue of Apollo in the
      Belvedere gallery of the Vatican palace at Rome, esteemed
      of the noblest representations of the human frame.
      [1913 Webster] Apollonian

WordNet (r) 3.0 (2006):

Apollo
    n 1: (Greek mythology) Greek god of light; god of prophecy and
         poetry and music and healing; son of Zeus and Leto; twin
         brother of Artemis [syn: Apollo, Phoebus, Phoebus
         Apollo]

Moby Thesaurus II by Grady Ward, 1.0:

168 Moby Thesaurus words for "Apollo":
   ATDA, ATS, Adonis, Agdistis, Alouette, Amen-Ra, Amor, Anna,
   Aphrodite, Apollo Belvedere, Apollo Musagetes, Apollon, Ares,
   Ariel, Artemis, Astarte, Ate, Athena, Atlas-Score, Bacchus, Balder,
   Biosatellite, Bragi, Calliope, Castilian Spring, Ceres, Cleopatra,
   Comsat, Cora, Cosmos, Courier, Cronus, Cupid, Cybele, Demeter,
   Despoina, Diana, Diapason, Dionysus, Dis, Discoverer, ERS,
   Early Bird, Echo, Elektron, Erato, Eros, Euterpe, Explorer, Freya,
   GATV, Gaea, Gaia, Ge, Gemini, Great Mother, Hades, Hebe, Helicon,
   Helios, Hephaestus, Hera, Here, Hermes, Hestia, Hippocrene, Hymen,
   Hyperion, Injun, Intelsat, Jove, Juno, Jupiter, Jupiter Fidius,
   Jupiter Fulgur, Jupiter Optimus Maximus, Jupiter Pluvius,
   Jupiter Tonans, Kore, Kronos, Lofti, Luna, Lunar Orbiter, Lunik,
   Magna Mater, Mariner, Mars, Mars probes, Mercury, Midas, Minerva,
   Mithras, Momus, Muse, Narcissus, Neptune, Nike, Nimbus, OAO, OGO,
   OSO, Olympians, Olympic gods, Ops, Orcus, Orpheus, Pageos,
   Parnassus, Pegasus, Persephassa, Persephone, Phoebus,
   Phoebus Apollo, Pierian Spring, Pierides, Pioneer, Pluto,
   Polyhymnia, Polymnia, Poseidon, Proserpina, Proserpine, Proton, Ra,
   Ranger, Relay, Rhea, Samos, San Marco, Saturn, Savitar, Secor,
   Shamash, Sol, Sputnik, Surveyor, Surya, Syncom, Tellus, Telstar,
   Terpsichore, Titan, Transit, Vanguard, Venus, Venus de Milo, Vesta,
   Viking, Voskhod, Vulcan, WRESAT, Zeus, Zond, afflatus,
   artificial satellites, creative imagination, fire of genius, houri,
   inspiration, peri, poesy, poetic genius, sacred Nine, spacecraft,
   the Graces, the Muses, the Nine, tuneful Nine



U.S. Gazetteer Places (2000):

Apollo, PA -- U.S. borough in Pennsylvania
   Population (2000):    1765
   Housing Units (2000): 856
   Land area (2000):     0.316472 sq. miles (0.819658 sq. km)
   Water area (2000):    0.034420 sq. miles (0.089148 sq. km)
   Total area (2000):    0.350892 sq. miles (0.908806 sq. km)
   FIPS code:            02720
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             40.584103 N, 79.564363 W
   ZIP Codes (1990):     15613
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Apollo, PA
    Apollo