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 (nĕm′ə-tōd′, nē′mə-)
Any of numerous worms of the phylum Nematoda, having unsegmented cylindrical bodies often narrowing at each end, and including free-living species that are abundant in soil and water, and species that are parasites of plants and animals, such as eelworms, pinworms, and hookworms. Also called roundworm.

[From New Latin Nēmatōda, phylum name : nemato- + New Latin -ōda (alteration of -oīdea, from neuter pl. of Greek -oeidēs, -oid).]

nem′a·tode′ adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈnɛməˌtəʊd) or


(Animals) 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 or roundworm
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈnɛm əˌtoʊd)

any unsegmented worm of the phylum Nematoda, having an elongated, cylindrical body and often parasitic on animals and plants; a roundworm.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


Any of several slender cylindrical worms, usually of tiny size, that live in great 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 are parasites on animals and humans and cause disease.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nematode - unsegmented worms with elongated rounded body pointed at both endsnematode - unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic
worm - any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae
Aschelminthes, Nematoda, phylum Aschelminthes, phylum Nematoda - unsegmented worms: roundworms; threadworms; eelworms
Ascaris lumbricoides, common roundworm - intestinal parasite of humans and pigs
Ascaridia galli, chicken roundworm - intestinal parasite of domestic fowl
Enterobius vermicularis, pinworm, threadworm - small threadlike worm infesting human intestines and rectum especially in children
eelworm - any of various small free-living plant-parasitic roundworms
Tylenchus tritici, wheat eel, wheat eelworm, wheatworm - small roundworm parasitic on wheat
trichina, Trichinella spiralis - parasitic nematode occurring in the intestines of pigs and rats and human beings and producing larvae that form cysts in skeletal muscles
hookworm - parasitic bloodsucking roundworms having hooked mouth parts to fasten to the intestinal wall of human and other hosts
filaria - slender threadlike roundworms living in the blood and tissues of vertebrates; transmitted as larvae by biting insects
Dracunculus medinensis, Guinea worm - parasitic roundworm of India and Africa that lives in the abdomen or beneath the skin of humans and other vertebrates
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


n. nematodo, gusano de la clase Nematoda;
alcoholic ______ alcohólica;
autonomic ______ autonómica;
hepatic ______ hepática.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
[USA], July 2 (ANI): According to a report issued by World Health Organisation, it has been found that over one billion people, including 880 million children, are infected with intestinal nematode worms, such as roundworms, hookworms and tapeworms.
The firm will do testing on nematode worms, which are valuable to ageing researchers as they have a short lifespan of just two or three weeks so large quantities can be studied over relatively short periods.
Recently, MOH instructed manufacturers of eight sardine brands of Cinta, TL Tan Lung, TLC, Sea Fresh, HS Brand, King Cup, Bintang and TC Boy to be withdrawn from the market due to contamination issue with nematode worms from genus Anisakis.
Infestations of Thelazia, a genus of nematode worms that live as parasites in the eye and its surrounding tissue, are most commonly seen in animals and birds.
They also cover certain Monsanto assets, which in future would have competed with a Bayer seed treatment against nematode worms. Finally, Bayer has committed to grant a licence to its entire global digital agriculture product portfolio and pipeline products to ensure continued competition on this emerging market.
An Oregon woman became the first human ever to be infected by a type of eye worm previously seen only in cattle after 14 "Thelazia gulosa" worms were removed from her eye, reports said Monday. The woman, Abby Beckley, was diagnosed in August 2016 with the genus of nematode worms, which is spread by a type of fly called "face flies," that feed on eyeball lubrication.
Dr Sharpe and MRes student, Daniela Lopes Cardoso interrogated large amounts of data from the genomes of nine animals -- from humans and macaque monkeys to nematode worms and the fruit fly, and calculated how diverse each was at the genetic level.
Insect killers such as predatory beetles and nematode worms are being sent into battle against foreign bugs that threaten mass destruction on Welsh forests, from the great spruce bark beetle to the large pine weevil.
On Tuesday, pathologist Dr Fouad Alchami said both men's kidney function was relatively normal in each case, but they had a "heavy infestation" of nematode worms in their brains.
But a new study, into nematode worms, suggests that the formation of free radicals (in technical terms, 'reactive oxygen species') made the worms live longer.
Fifty adult nematode worms were collected and identified morphologically according to Mohiuddin et al.
Twenty-four years ago the field of aging research was galvanized when it was discovered that modification of a single gene could more than double the maximum life span of nematode worms. (1) Since that time genetic manipulations have been used to increase the life span of many species, including the creation of Ames dwarf mice, which live nearly 50% longer than their genetically normal siblings.