Source : Webster's Revised Unabridged Dictionary (1913)

Canopus \Ca*no"pus\, n. [L. Canopus, fr. Gr. ?, town of Egypt.]
   (Astron.)
   A star of the first magnitude in the southern constellation
   Argo.

Source : WordNet®

Canopus
     n : supergiant star 650 light years from Earth; second brightest
         star in the sky