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