noun
A parasitic worm that infects the small intestine, especially the duodenum. Medical term.
十二指腸虫は、小腸に寄生する寄生虫の一種です。
The hookworm is a type of parasite that infests the small intestine.
Compound of 十二指腸 (duodenum) + 虫 (worm, insect). The name reflects the worm's typical habitat in the duodenum.