idiogenesis

id·i·o·gen·e·sis

(id'ē-ō-jen'ĕ-sis),
Origin without evident cause; denoting especially that of an idiopathic disease.
[idio- + G. genesis, production]

id·i·o·gen·e·sis

(id'ē-ō-jen'ĕ-sis)
Origin without evident cause.
[idio- + G. genesis, production]