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roundworm (round´wәrm)   any member of the class Nematoda, somewhat resembling common earthworms in appearance; many are found as parasites in humans or other animals. Those most frequently infecting humans include Ascaris lumbricoides (see ascariasis); Enterobius vermicularis (the pinworm; see enterobiasis); the hookworm (see hookworm disease); the filaria (see filariasis); and the trichina (see trichinosis).




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