The anus is the opening at the end of the digestive tract.
proctology
anal valve; valvulae anales
anal stage
proctology department; proctology clinic; proctology
anal gland
Standard kanji spelling; the most common written form.
Mixed kanji-kana spelling, sometimes used for readability or in contexts where the first kanji is difficult.
The kanji 肛 means 'anus' and 門 means 'gate'; together they form the anatomical term for the anal opening. The reading こうもん is the on'yomi of both characters.