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A case is examined of an adult with intussusception due to Ancylostoma dubini. Ancylostoma dubini is not listed in the dictionary, but if it exists, rules of nomenclature would prescribe its written form as shown above. The patient is a 35-year-old female with lower abdominal pain of 6 month's duration. On 28 May 1986, she complained of severe abdominal pain, nausea and vomiting. A moving mass was palpable in the left side abdominal region. Plain X-ray of the abdomen revealed specific niveau. An emergency operation was performed for suspected intussusception of the small intestine. A jejuno-jejunal intussusception, 9 cm in length, was found about 50 cm from the Treitz ligament. It was not reducible and rejection was performed. A tumor, 1cm in size, was found 20 cm distally. It was also rejected. An Ancylostoma dubini had bit into the mucous membrane of the tumor and there was a granuration change with bleeding. Although an Ancylostoma dubini wasn't found at the apex of the intussusception which was in necrosis, the granuration change due to the ancylostoma was considered to be the cause of intussusception. Reports of intussusception in adults due to parasites is rare, especially one caused by Ancylostoma dubini.