n.; pl. Ascarides r Ascarids. [ NL. ascaris, fr. Gr. &unr_;. ] (Zool.) A parasitic nematoid worm, especially the roundworm, Ascaris lumbricoides, often occurring in the human intestine, and allied species found in domestic animals; also commonly applied to the pinworm (Oxyuris), often troublesome to children and aged persons. [ 1913 Webster ]

n. a natural family of large roundworms parasitic in intestines of vertebrates.
Syn. -- family Ascaridae. [ WordNet 1.5 ]

n. a roundworm having a preanal sucker.
Syn. -- genus Ascaridia. [ WordNet 1.5 ]