Source : Webster's Revised Unabridged Dictionary (1913)

Eugenics \Eu*gen"ics\, n.
   The science of improving stock, whether human or animal. --F.
   Galton.

Source : WordNet®

eugenics
     n : the study of methods of improving genetic qualities by
         selective breeding (especially as applied to human
         mating) [ant: {dysgenics}]