The Collaborative International Dictionary of English v.0.48:

Seminific \Sem`i*nif"ic\, Seminifical \Sem`i*nif"ic*al\, a. [L.
   semen, seminis, seed + facere to make.] (Biol.)
   Forming or producing seed, or the male generative product of
   animals or of plants.
   [1913 Webster]