histopathologist

noun
his·​to·​pa·​thol·​o·​gist | \ ˌhis-tō-pə-ˈthäl-ə-jəst, -pa- How to pronounce histopathologist (audio) \

Medical Definition of histopathologist

: a pathologist who specializes in the detection of the effects of disease on body tissues especially : one who identifies tumors by their histological characteristics