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1680s, "pertaining to disease," formed in English from pathologic + -al (1). Sense of "worthy to be a subject of pathology, morbid, excessive" (e.g. pathological liar) is attested from 1845. Related: Pathologically.
pathological path·o·log·i·cal (pāth'ə-lŏj'ĭ-kəl) or path·o·log·ic (-ĭk)adj.
Of or relating to pathology.
Relating to or caused by disease.