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spider

 [spi´der]
1. an arthropod of the class Arachnida.
spider bite in the United States, the two spiders whose bites are most likely to cause a serious reaction are the black widow spider(Latrodectus mactans) and the brown recluse spider(Loxosceles reclusa). Signs and symptoms are associated with the effects of injection of the venom and include pain at the injection site, weakness, muscle pain and cramps, elevated blood pressure, and restlessness. Bites by these spiders must be treated promptly and effectively. First aid is the same as that for a snakebite and includes the following:

1. Wash the wound with soap and water and apply a clean dressing.

2. Apply a constricting band between the area of the bite and the heart.

3. Keep the person calm and transport him to the hospital or medical facility as soon as possible.

4. If swelling becomes apparent, apply a cold compress to the area.
black widow spider Latrodectus mactans, a poisonous spider found in North America; see spider bite.
brown recluse spider Loxosceles reclusa, a poisonous spider found in North America; see spider bite.
vascular spider a telangiectasis due to dilatation and branching of superficial cutaneous arteries, which presents as a bright red central portion with branching radiations, the whole somewhat resembling the configuration of a spider. The lesions may occur singly or in large numbers, and may be nevoid or acquired, being commonly associated with pregnancy and liver disease. Called also nevus araneus, spider nevus, and spider telangiectasia.

spi·der

(spī'dĕr),
1. An arthropod of the order Araneida (subclass Arachnida) characterized by four pairs of legs; a cephalothorax; a globose, smooth abdomen; and a complex of web-spinning spinnerets. Among the venomous spiders found in the New World are the black widow spider, Latrodectus mactans; red-legged widow spider, Latrodectus bishopi; pruning spider, or Peruvian tarantula, Glyptocranium gasteracanthoides; Chilean brown spider, Loxosceles laeta; Peruvian brown spider, Loxosceles rufipes; brown recluse spider of North America, Loxosceles reclusus.
2. An obstructive growth in the teat of a cow.
[O. E. spinnan, to spin]

spider

/spi·der/ (spi´der)
1. an arthropod of the class Arachnida.

arterial spider  vascular s.
black widow spider  a spider, Latrodectus mactans, whose bite causes severe poisoning.
vascular spider  a telangiectasis caused by dilatation and ramification of superficial cutaneous arteries, appearing as a bright red central area with branching rays somewhat resembling a spider; commonly associated with pregnancy and liver disease.

spider

(spī′dər)
n.
Any of numerous arachnids of the order Araneae, having a body divided into a cephalothorax and an abdomen, eight legs, two chelicerae that bear venom glands, and two or more spinnerets that produce the silk used to make nests, cocoons, or webs for trapping insects.
A term of art referring to a thing likened to a spider, either morphologically, or functionally
Dermatology See Spider angioma
Entomology A chelicerate arthropod of the class Arachnida, which has 8 legs, a cephalothorax, a smooth, round abdomen, and equipment for spinning webs; 2 spiders are of medical importance in the US: Latrodectus mactans, the black widow spider, and Loxosceles reclusa, the North American brown recluse spider
Online A software program that resides in a PC and, when launched, crawls the Web for requested information, searching for keywords in the title or text of digitalised documents, simultaneously scanning entire libraries of documents, and tracking down millions of cross-references; when finished, the spider ranks the files in order of probable relevance

spider

Dermatology See Spider angioma Entomology A chelicerate arthropod of the class Arachnida, which has 8 legs, a cephalothorax, a smooth, round abdomen, and equipment for spinning webs; 2 spiders are of medical importance in the US: Lactrodectus mactans, the black widow spider and Loxosceles reclusus, the North American brown recluse spider. See Black widow spider, Brown recluse spider.

spi·der

(spī'dĕr)
1. An arthropod of the order Araneida characterized by having four pairs of legs; a cephalothorax; a globose, smooth abdomen; and a complex of spinnerets, which build the web. Among the venomous spiders are the black widow spider, Latrodectus mactans, and the brown recluse spider, Loxosceles reclusus.
2. Synonym(s): spider angioma.
[O. E. spinnan, to spin]

spider

an arthropod of the class Arachnida.

black widow spider
see latrodectus mactans.
brown recluse spider
a poisonous spider, Loxoceles reclusa, whose bite causes severe poisoning in humans.
spider lily
see crinum.
trapdoor spider
Atrax robustus. Called also funnel-web spider.
spider grass
brachyachneconvergens.
spider lamb syndrome
inherited arachnomelia.
References in periodicals archive ?
Donna Hopkins, with baby Warren, found a tube web spider (top left) in a bag of peppers.
Associate Professor Daiqin Li, who led the team at the National University of Singapore, said that ants rarely occur on the web of orb web spiders, despite their abundance, so his team set out to discover why.
In work on orb web spiders, the frequency of relocation, or its inverse, the average length of residence at a site, has been used to demonstrate a response to factors such as changes in prey levels (Olive 1982; Vollrath 1985) , web damage (Enders 1976), and intraspecific interactions (Smallwood 1993).
Silk mediated defense by an orb web spider against predatory mud-dauber wasps.
The evolutionary reduction of site tenacity, made possible after the appearance of a less costly orb web (see below), could be a mechanism facilitating speciation, because it allowed a fast and opportunistic exploitation of new resources that is the ancestral condition promoting orb web spider high Triassic diversification (Vollrath & Selden 2007).
FUR OUT: Our bat is fangs-tastic, but the Sphinx Cat has it licked for looks; BORN SLIPPY: The hungry Moray Eel is armed with razor-sharp teeth; EYES HAVE IT: The Funnel Web Spider is always eager for passing trade; TAILS YOU LOSE: Try your luck with the Two Headed Shingleback; SO CREEPY: A Termite Queen and her workers, left, and the Elephant Weevil; ODOUR EATER: The Star Nosed Mole is officially the planet's fastest muncher
The premier issue of Newsline will highlight recently-added features and information available on the ALM Research Online(TM) Web site, including a new database of law firm-related articles, advanced search features and the Law Firm Web Spider, which enables searches of more than 800 law firm Web sites.
The predatory behavior of the nocturnal orb web spider Eriophora fidiginea.
Harvest is defined as compiling or stealing email addresses through anonymous collection procedures such as via a Web spider, through chat rooms, or other publicly displayed areas listing personal or business email addresses.
The web spider community of soybean agroecosystems in southwestern Ohio.
Once 20 people second a nomination, it hits the "WHN Hot List" and the WhatsHotNow Web Spider technology starts searching the Internet to see what media and Web mentions have occurred.