Source : Webster's Revised Unabridged Dictionary (1913)

Physiogeny \Phys`i*og"e*ny\, n. [Gr. fy`sis nature + root of ?
   to be born.] (Biol.)
   The germ history of the functions, or the history of the
   development of vital activities, in the individual, being one
   of the branches of ontogeny. See {Morphogeny}. --Haeckel.