回虫

(1)type genus of the family Ascaridae: roundworms with a three-lipped mouth

(2)回虫科の標準属：3つの唇のある口を持つ回虫

(3)unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic

(4)両端が尖った細長くて丸い体の無体節ぜん虫

(5)ほとんど自由生活性だが、あるものは寄生する