spider (redirected from Spiders)

spider /spi·der/ (spi´der)

1. an arthropod of the class Arachnida.

2. vascular s.

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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.

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spi·der (spdr)

n.

1. Any of numerous arachnids of the order Araneae, having a body divided into a cephalothorax bearing eight legs, two poison fangs, and two feelers and an unsegmented abdomen bearing several spinnerets that produce the silk used to make nests, cocoons, or webs for trapping insects.

2. An arterial spider.

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spider

an arthropod of the class Arachnida.

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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.

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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.