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Webster 1913 Edition

Noun.

(Med.)

(a)

The generation, and method of development, of disease;

as, the

pathogeny

of yellow fever is unsettled

(b)

That branch of pathology which treats of the generation and development of disease.

pathogeny ‎(plural pathogenies)

(medicine) The generation and method of development of disease.
The pathogeny of yellow fever is unsettled.