Source : Webster's Revised Unabridged Dictionary (1913)

Cygnus \Cyg"nus\ (s?g"n?s), n. [L., a swan.] (Astron.)
   A constellation of the northern hemisphere east of, or
   following, Lyra; the Swan.

Source : WordNet®

Cygnus
     n 1: a constellation in the northern hemisphere between Pegasus
          and Draco in the Milky Way; contains a black hole
     2: a genus of Anatidae [syn: {genus Cygnus}]