peri·proct \ˈperəˌpräkt\noun (-s) Etymology: International Scientific Vocabulary peri- + Greek prōktos anus — more at proct- : the well-defined area surrounding the anus of various invertebrates (as a sea urchin) • peri·proc·tal\| ̷ ̷ ̷ ̷|präktəl\orperi·proc·tic\-ktik\orperi·proc·tous\-ktəs\adjective