Source : Webster's Revised Unabridged Dictionary (1913)

Varuna \Va*ru"na\ (v[.a]*r[udd]"n[.a]), n. [Skr. Varu[.n]a.]
   (Hindu Myth.)
   The god of the waters; the Indian Neptune. He is regarded as
   regent of the west, and lord of punishment, and is
   represented as riding on a sea monster, holding in his hand a
   snaky cord or noose with which to bind offenders, under
   water.

Source : WordNet®

Varuna
     n : in Vedism, god of the night sky who with his thousand eyes
         watches over human conduct and judges good and evil and
         punishes evildoers; often considered king of the Hindu
         gods and frequently paired with Mitra as an upholder of
         the world