The Collaborative International Dictionary of English v.0.48:

Olympus \Olympus\ prop. n.
   A mountain in Northeastern Greece; -- it was believed by
   ancient Greeks to be the dwelling place of the gods.

   Syn: Mount Olympus, Mt. Olympus, Olimbos.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Olympus
    n 1: a mountain peak in northeast Greece near the Aegean coast;
         believed by ancient Greeks to be the dwelling place of the
         gods (9,570 feet high) [syn: Olympus, Mount Olympus,
         Mt. Olympus, Olimbos]