proctologyPronunciation: /prɒkˈtɒlədʒi/Definition of proctology noun [mass noun] the branch of medicine concerned with the anus and rectum. Derivatives proctologicalPronunciation: /-təˈlɒdʒɪk(ə)l/ adjective proctologist noun Origin: late 19th century: from Greek prōktos 'anus' + -logyproctology in other Oxford dictionaries Definition of proctology in the US English dictionary