1.Definition: caused by or altered by or manifesting disease or pathology

"Pathological bodily processes"

Related Adjective(s):diseased, morbid, pathologic

2.Definition: caused by or evidencing a mentally disturbed condition

"A pathological liar", "A pathological urge to succeed"

3.Definition: of or relating to the practice of pathology

"Pathological laboratory"

Related Adjective(s):pathologic