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n. Abnormal organic development.

n. The birth of a living being from a parent of a different kind; having two different forms in the life cycle.

n. Spontaneous generation, so called.

n. That method of reproduction in which the successive generations differ from each other, the parent organism producing offspring different in habit and structure from itself, the original form, however, reappearing after one or more generations; -- opposed to homogenesis, or gamogenesis.

n. Production by an external cause — that is, a cause different from the effect. Also called heterogeny.

n. In biology: The spontaneous generation of animals and vegetables low in the scale of organization from inorganic elements; abiogenesis.

n. That kind of generation in which the parent, whether plant or animal, produces offspring differing in structure and habit from itself, but in which after one or more generations the original form reappears.

n. the alternation of two or more different forms in the life cycle of a plant or animal

"Stagnant pools were found full of them, and the obvious difficulty of assigning a germinal origin to existences so minute furnished the precise condition necessary to give new play to the notion of heterogenesis or spontaneous generation."

homogenesis    gamogenesis   

organic phenomenon   

metagenesis    digenesis   

heterogenetic