Any of several worms of the phylum Nematoda, having unsegmented, cylindrical bodies, often narrowing at each end, and including parasitic forms such as the hookworm and pinworm.
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美
- 线虫线虫纲动物的任何一种小虫,身体不分节,呈柱状,两头稍尖,包括钩虫和蛲虫一样的寄生虫