Relating to the study of symptoms, especially in medicine.
This word is used in serious and scientific situations, like in a hospital or a research lab.
Examples:
The doctor's symptomatological research helped find a cure.
She is an expert in symptomatological studies.
The symptomatological report showed many problems.
The symptomatological book is very big and hard to read.
In the symptomatological lab, they study many sick people.
The symptomatological study was very important for the hospital.