Source : Webster's Revised Unabridged Dictionary (1913)

Organicism \Or*gan"i*cism\, n. (Med.)
   The doctrine of the localization of disease, or which refers
   it always to a material lesion of an organ. --Dunglison.

Source : WordNet®

organicism
     n : theory that the total organization of an organism rather
         than the functioning of individual organs is the
         determinant of life processes