pathologicalPronunciation: /paθəˈlɒdʒɪk(ə)l/ (North American also pathologic)Translate pathological | into French | into German | into Italian | into Spanish Definition of pathological adjective 1relating to pathology:the interpretation of pathological studies 2involving or caused by a physical or mental disease:glands with a pathological abnormality 3 informal compulsive; obsessive:a pathological gamblerDerivatives pathologically adverb pathological in other Oxford dictionaries Definition of pathological in the US English dictionary