1. of or relating to the practice of pathology (Freq. 5) - pathological laboratory • Syn: pathologic • Pertains to noun: pathology (for: pathologic), pathology • Derivationally related forms: pathology (for: pathologic), pathology 2. caused by or evidencing a mentally disturbed condition (Freq. 1) - a pathological liar - a pathological urge to succeed • Similar to: neurotic, psychoneurotic • Derivationally related forms: pathology 3. caused by or altered by or manifesting disease or pathology - diseased tonsils - a morbid growth - pathologic tissue - pathological bodily processes • Syn: diseased, morbid, pathologic • Similar to: unhealthy • Derivationally related forms: pathology, pathology (for: pathologic), morbidity (for: morbid)