Nematoidea (?), prop. n. pl. [NL., fr. Gr. nh^ma, nhmatos, thread + -oid.] (Zoöl.) A phylum of worms, having a long, round, and generally smooth body; the roundworms. Called also Nematodea, and more commonly Nematoda. Formerly, it was classed as a taxonomic order.[1913 Webster +PJC]
&hand_; The trichina, stomach worm, and pinworm of man belong to this group. See also Vinegar eel, under Vinegar, and Gapeworm.[1913 Webster]