metagenesis
noun
meta·gen·e·sis ˌme-tə-ˈje-nə-səs 
: alternation of generations in animals
especially : regular alternation of a sexual and an asexual generation
metagenetic
ˌme-tə-jə-ˈne-tik
adjective 
Word History
Etymology
New Latin
First Known Use
1849, in the meaning defined above
Medical Definition
metagenesis
noun
meta·gen·e·sis -ˈjen-ə-səs
plural metageneses -ˌsēz
: alternation of generations
especially : regular alternation of a sexual and an asexual generation