What is "solidism"

Solidism \Sol"id*ism\, n. (Med.) The doctrine that refers all diseases to morbid changes of the solid parts of the body. It rests on the view that the solids alone are endowed with vital properties, and can receive the impression of agents tending to produce disease.

n. (context medicine obsolete English) The doctrine that the solid parts of the body are the only parts that have vital properties and are susceptible to disease.