Wordnet 3.0
NOUN (1)
1. 
 the study of the operation of factors causing degeneration in the type of offspring produced; 
[syn: dysgenics, cacogenics]
The Collaborative International Dictionary of English v.0.48:
cacogenics \cacogenics\ n.
   the study of the operation of factors causing degeneration in
   the type of offspring produced.
   Syn: dysgenics.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
cacogenics
    n 1: the study of the operation of factors causing degeneration
         in the type of offspring produced [syn: dysgenics,
         cacogenics] [ant: eugenics]