The Collaborative International Dictionary of English v.0.48:

Urania \U*ra"ni*a\, n. [L., from Gr. ?, i. e., the Heavenly, fr.
   ? heavenly, fr. ? heaven.]
   [1913 Webster]
   1. (Class. Myth.) One of the nine Muses, daughter of Zeus by
      Mnemosyne, and patron of astronomy.
      [1913 Webster]

   2. (Zool.) A genus of large, brilliantly colored moths native
      of the West Indies and South America. Their bright colored
      and tailed hind wings and their diurnal flight cause them
      to closely resemble butterflies.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Urania
    n 1: (Greek mythology) the Muse of astronomy
    2: goddess of love; counterpart of Greek Aphrodite [syn:
       Venus, Urania]