WordReference Random House Learner's Dictionary of American English © 2019
pa•thol•o•gy /pəˈθɑlədʒi/USA pronunciation   n., pl.  -gies. 
  1. Pathology[uncountable] the study of diseases.
  2. Pathology[countable] any condition that is not healthy or normal.
path•o•log•i•cal /ˌpæθəˈlɑdʒɪkəl/USA pronunciation  adj.: a pathological liar.
pa•thol•o•gist, n. [countable]See -path-.

WordReference Random House Unabridged Dictionary of American English © 2019
pa•thol•o•gy  (pə tholə jē),USA pronunciation n., pl.  -gies. 
  1. Pathologythe science or the study of the origin, nature, and course of diseases.
  2. Pathologythe conditions and processes of a disease.
  3. Pathologyany deviation from a healthy, normal, or efficient condition.
pa•tholo•gist, n. 
  • Greek pathología. See patho-, -logy
  • Latin
  • earlier pathologia 1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::

pathology /pəˈθɒlədʒɪ/ n ( pl -gies)
  1. the branch of medicine concerned with the cause, origin, and nature of disease, including the changes occurring as a result of disease
  2. the manifestations of disease, esp changes occurring in tissues or organs

paˈthologist n

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