cenogenetic
adjective
ce·no·ge·net·ic
variants:
or coenogenetic
or chiefly British caenogenetic \ ˌsē-nə-jə-ˈnet-ik, ˌsen-ə- 
\
\
Medical Definition of cenogenetic
: relating to or being a specialized adaptive character (as the amnion or chorion surrounding the embryo of higher vertebrates) that is not represented in primitive ancestral forms