Source : Webster's Revised Unabridged Dictionary (1913)

Xenogenesis \Xen`o*gen"e*sis\, n. [Gr. xe`nos a stranger + E.
   genesis.] (Biol.)
   (a) Same as {Heterogenesis}.
   (b) The fancied production of an organism of one kind by an
       organism of another. --Huxley.

Source : WordNet®

xenogenesis
     n : the alternation of two or more different forms in the life
         cycle of a plant or animal [syn: {alternation of
         generations}, {heterogenesis}]