nem·​a·​tode | \ ˈne-mə-ˌtōd How to pronounce nematode (audio) \

Definition of nematode

: any of a phylum (Nematoda or Nemata) of elongated cylindrical worms parasitic in animals or plants or free-living in soil or water

called also roundworm

Examples of nematode in a Sentence

Recent Examples on the Web There are many species of round worms (nematodes) that can infest fish. Joe Genzel, Outdoor Life, "10 Common Parasites and Diseases Found in Game Fish (and What You Need to Know About Them)," 27 May 2020 The researchers found the nematodes in lizards from only that first Pyrenees population. Sandrine Ceurstemont, Scientific American, "Parasites Thrive in Lizard Embryos’ Brain," 1 May 2020 Nothing to be done for the contaminated plates or the dying nematodes. New York Times, "‘Real Life,’ by Brandon Taylor: An Excerpt," 18 Feb. 2020 The most important part of soft pest-control in spring is the release of Trichogramma wasps and beneficial nematodes. Howard Garrett, Dallas News, "To keep pests out of your new garden, it’s all about maintaining a natural balance," 30 Mar. 2020 Marigolds and Melons Certain marigold varieties control nematodes in the roots of melon without using chemical treatments. The Editors, Good Housekeeping, "26 Plants You Should Always Grow Side-By-Side," 24 Apr. 2020 Steinernema nematodes, Hypoaspis predatory mites, and the biological insecticide Bacillus thuringiensis subspecies israelensis. oregonlive, "Coronavirus means you’re spending more time in your backyard -- what are those flying bugs?," 9 Apr. 2020 Infestation starts when a host accidentally consumes a nematode’s eggs. The Economist, "Animal husbandry Nematode parasites kill a lot of sheep," 21 Nov. 2019 Add beneficial nematodes once danger of frost has passed, and consider adding plants for pollinator support early in the season—the Xerces Society has recommendations for every region. Heather Arndt Anderson, Sunset Magazine, "Your Ultimate Spring Gardening To-Do List for March and April," 16 Mar. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'nematode.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of nematode

1865, in the meaning defined above

History and Etymology for nematode

ultimately from Greek nēmat-, nēma

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Time Traveler for nematode

Time Traveler

The first known use of nematode was in 1865

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Statistics for nematode

Last Updated

5 Jun 2020

Cite this Entry

“Nematode.” Dictionary, Merriam-Webster, Accessed 3 Aug. 2020.

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More Definitions for nematode


nem·​a·​tode | \ ˈnem-ə-ˌtōd How to pronounce nematode (audio) \

Medical Definition of nematode

 (Entry 1 of 2)

: of or relating to the phylum Nematoda



Medical Definition of nematode (Entry 2 of 2)

: any worm of the phylum Nematoda

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