rectal /ˈrɛk.təl/adjective 1noun 1forms 1 adjective1 •Of, via or related to the rectum.The customs inspector subjected him to a rectal exam. noun1 •(informal) Ellipsis of rectal examination.Most doctors feel a rectal examination is unnecessary following a full pelvic examination, so that rectals are not routinely performed on women. — 1988 formsrectals