- Any of a group of parasitic nematodes that usually require two hosts to complete the life cycle: an arthropod and another animal, which is bitten by the arthropod.The female worm produces large numbers of microscopic, active embryos, called microfilariae, that pass into the bloodstream of the primary host. These enter the body of an insect when it bites the infected animal; within the insect the microfilariae grow into larvae, which are passed to an animal the insect bites, where they complete their growth. See also heartworm.
* * *▪ nematodeany of a group of parasitic worms of the family Filariidae (phylum Nematoda) that usually require two hosts, an arthropod (the intermediate host) and a vertebrate (the primary host), to complete the life cycle. The larval phase occurs within the body of a biting insect. The mature (reproductive) phase occurs in the body of an animal bitten by the insect.The female worm produces large numbers of microscopic, active embryos called microfilariae that pass into the bloodstream of the primary host. The microfilariae may then enter the body of an insect as the insect bites the infected animal. The microfilariae grow into larvae in the insect's muscles and may then be passed to the primary host when the insect bites an animal. The larvae reach adulthood within the vertebrate host, and the cycle repeats. In mammals filarial worms cause a group of infectious disorders including heartworm, elephantiasis, and river blindness. These disorders are known collectively as filariasis. At present, more than 200 million people are infected with filarial parasites.
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worm — wormer, n. wormlike, wormish, adj. /werrm/, n. 1. Zool. any of numerous long, slender, soft bodied, legless, bilaterally symmetrical invertebrates, including the flatworms, roundworms, acanthocephalans, nemerteans, gordiaceans, and annelids. 2.… … Universalium
filarial — adj. pertaining to a threadlike roundworm (type of parasitic worm) … English contemporary dictionary
eye worm — noun : a parasitic worm found in the eye: as a. : either of two slender nematode worms (Oxyspirura mansoni and O. petrowi) living beneath the nictitating membrane of the eyes of chickens or other birds b. : a member of a genus (Thelazia) of… … Useful english dictionary
eye worm — a filarial worm, Loa loa, of western and central Africa, that is parasitic in the skin, or subcutaneous tissue, of human beings, often migrating into the eye region. [1585 95] * * * ▪ parasite (species Loa loa), common parasite of humans… … Universalium
eye worm — n a parasitic worm found in the eye: as a) either of two slender nematode worms of the genus Oxyspirura (O. mansoni and O. petrowi) living beneath the nictitating membrane of the eyes of birds and esp. chickens b) any member of the nematode genus … Medical dictionary
eye worm — noun 1》 a filarial worm of equatorial Africa, affecting the eyes. [Loa loa.] 2》 a nematode worm that occurs in the region of the eyelid and tear duct, found chiefly in hoofed mammals. [Genus Thelazia.] … English new terms dictionary
nodular worm — noun also nodule worm 1. : any of several nematode worms (genus Oesophagostomum) that are parasitic in the large intestine of ruminants and swine where they cause swellings of the intestinal wall resembling abscesses 2. : a filarial worm… … Useful english dictionary
Elephantiasis — Lymphatic filariasis, a mosquito borne parasitic disease caused by tiny thread like worms that live in the human lymph system. Best known from dramatic photos of people with grossly enlarged or swollen arms and legs. The parasitic worms… … Medical dictionary
drug — drug1 /drug/, n., v., drugged, drugging. n. 1. Pharm. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well being. 2. (in federal law) a. any substance… … Universalium
Drug — /droog/, n. Zoroastrianism. the cosmic principle of disorder and falsehood. Cf. Asha. [ < Avestan drauga] * * * I Any chemical agent that affects the function of living things. Some, including antibiotics, stimulants, tranquilizers,… … Universalium