[pa.thol.o.gy] n, pl -gies [NL pathologia & MF pathologie, fr. Gk pathologia study of the emotions, fr. path- + -logia -logy] (1611) 1: the study of the essential nature of diseases and esp. of the structural and functional changes produced by them
2: something abnormal: a: the structural and functional deviations from the normal that constitute disease or characterize a particular disease b: deviation from propriety or from an assumed normal state of something nonliving or nonmaterial