round.worm HraJnd7wV:m, $-wV:rm n [C] any of various types of WORM with a round body that can live in the bowels of people and particular animals, esp. pigs, and often cause disease 线虫，蛔虫 Roundworms are parasitic. 线虫是寄生虫。 a roundworm infestation 线虫寄生侵扰