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[nem-uh-tohd] /ˈnɛm əˌtoʊd/
any unsegmented worm of the phylum Nematoda, having an elongated, cylindrical body; a roundworm.
pertaining to the Nematoda.
1860-65; nemat- + -ode1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for nematodes
  • A nematicide is a type of chemical pesticide used to kill parasitic nematodes.
British Dictionary definitions for nematodes


any unsegmented worm of the phylum (or class) Nematoda, having a tough outer cuticle. The group includes free-living forms and disease-causing parasites, such as the hookworm and filaria Also called nematode worm, roundworm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for nematodes



1865, from Modern Latin Nematoda, the class or phylum name.

Online Etymology Dictionary, © 2010 Douglas Harper
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nematodes in Medicine

nematode nem·a·tode (něm'ə-tōd')
A parasitic worm of the class Nematoda. Also called roundworm.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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nematodes in Science
Any of several slender, cylindrical worms of the group Nematoda, which some scientists consider to be a class of the aschelminths and others to be a separate phylum. Most nematodes are tiny and live in enormous numbers in water, soil, plants, and animals. They have a simple structure, with a long hollow gut separated from the body wall by a fluid-filled space. Several nematodes, such as pinworm, roundworm, filaria, and hookworm, are parasites on animals and humans and cause disease. One species, Caenorhabditis elegans (usually called C. elegans), was one of the first animals to have its entire genome sequenced and is important in biological research as a model organism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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