DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Io
       n 1: (Greek mythology) a maiden seduced by Zeus; when Hera was
            about to discover them together Zeus turned her into a
            white heifer
       2: the closest of Jupiter's moons; has active volcanoes