Definition of dysgenesic:
(adj) :
(genetics) Of, pertaining to, or causing dysgenesis.
(adj) :
(more broadly) Tending to stunt to interfere with normal healthy development.
(adj) :
(of a hybrid) Infertile when crossed with a similar hybrid but marginally fertile when crossed with one of the parent species.
(adj) :
Tending to promote childlessness.
(adj) :
(by extension, eugenics, racism) Involving reproduction by couples of different races, believed to lead to inferior offspring.