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anus

noun
🔊/ˈeɪnəs/
🔊/ˈeɪnəs/
 (anatomy解剖学)
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  1. the opening in a person’s or animal's bottom through which solid waste leaves the body 肛门
    see also analTopics Bodyc2
    Word Originlate Middle English: from Latin, originally ‘a ring’.