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]
" The trichina, stomach worm, and pinworm of man belong to this group. See also Vinegar eel, under Vinegar, and Gapeworm."
[1913 Webster]