Etymology
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proctology (n.)

"branch of medicine concerned with the anus or rectum," 1896, from Latinized form of Greek prōktos "anus" (from PIE *prokto-, source also of  Armenian erastan-k' "buttocks") + -logy "study of." Related: Proctologist (1897).

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Definitions of proctology

proctology (n.)
the branch of medicine dealing with the diagnosis and treatment of disorders of the colon or rectum or anus;
From wordnet.princeton.edu