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a phylum of unsegmented, bilaterally symmetrical worms whose bodies are almost entirely covered with a cuticle; the class nematoda (roundworms) contains many important parasites.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
A former phylum of the Metazoa that included the class Nematoda and a disparate assortment of other pseudocelomates, each now accorded separate phylum status; they are nonsegmented, bilaterally symmetric, and cylindric or filiform, with a pseudocele body cavity and rounded or pointed ends; they vary considerably in size, and the male is usually smaller than the female.
Farlex Partner Medical Dictionary © Farlex 2012
AschelminthesAn obsolete phylum, the members of which are now classified in separate phyla, including Acanthocephala, Gastrotricha, Nematoda, Nematomorpha, Rotifera and others.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.