1. The swan, a genus of birds of the duck family.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• cesnus,
• cyclus,
• cenus,
• cognos,
• acynus,
• asygous,
• zygous,
• coenus,
• cyemus,
• cynus,
• cygus,
• cygnuss,
• lychnus,
• lygius,
• oegnus,
• cyymous,
• cymous,
• Lygnose,
• yunus,
• signus

The adjective form of the word "Cygnus" is "Cygnian".

The plural form of the word "cygnus" is "cygnes".

The singular form of the word "cygnus" is "cygnus".