Pathologist (noun)

1. A doctor who specializes in the study of diseases and the changes that occur in tissues and organs of the body.
2. A specialist in the study of pathology.

Origin:

From the greek word 'pathos' meaning 'suffering' and 'logos' meaning 'science'.

Examples:

1. The pathologist performed an autopsy on the body to determine the cause of death.
2. A pathologist analyzed the tissue samples to diagnose the patient's illness.
3. The pathologist's report showed that the patient had stage 4 cancer.
4. The pathologist was an expert in his field and had many years of experience.
5. The pathologist's testimony was crucial in the court case, as it provided evidence for the prosecution.