brown recluse spider

Also found in: Dictionary, Thesaurus, Financial, Acronyms, Encyclopedia, Wikipedia.


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.

brown recluse spider

A venomous spider (Loxosceles reclusa) having a violin-shaped mark on the cephalothorax, native to the southern and central United States and found in dark undisturbed areas such as closets and sheds. Also called fiddleback spider.

brown recluse spider

a small poisonous arachnid, Loxosceles reclusa, also known as the brown or violin spider, found in both North and South America. The bite produces a characteristic necrotic lesion. The venom from its bite usually creates a blister surrounded by concentric white and red circles. This so-called bull's-eye appearance is helpful in distinguishing it from other spider bites. There is little or no initial pain, but localized pain develops in about an hour. The patient may experience systemic symptoms; nausea, fever, and chills are common, but the reaction is usually self-limited. Immediate treatment includes keeping the victim quiet and immobilizing the bite area at the level of the heart. A bleb forms, sometimes in a target or bull's-eye pattern. The blood-filled bleb increases in size and eventually ruptures, leaving a black scar. Antivenin is not available in the United States.
enlarge picture
Brown recluse spider
enlarge picture
Brown recluse spider bite after 48 hours

rec·luse spi·der

(rek'lūs spī'dĕr)
The (brown) recluse spider is a venomous representative, Loxosceles reclusa, of the family Sicariidae (formerly of the family Loxoscelidae); native to the United States from the southern Midwest south to the Gulf of Mexico, but found elsewhere too. Most bites are minor with no necrosis, but consequences may be worse in some cases.
Synonym(s): brown recluse 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
spider lamb syndrome
inherited arachnomelia.
References in periodicals archive ?
Bites of brown recluse spiders and suspected necrotic arachnidism.
Patient 3, A 39-year-old woman was bitten by what we assumed was a brown recluse spider on the left upper eyelid while she was exploring a cave.
Previous studies at our institution have been performed to evaluate the effect of the brown recluse spider venom (BRSV) on human citrated plasma in vitro.
The most common symptom of a brown recluse spider bite, Leach et al report, is:
History should exclude Lyme disease, rickettsia pox, and, in some parts of the country, brown recluse spider bites.
History should exclude the possibilities of Lyme disease, rickettsia pox, and, in some regions, brown recluse spider bites.
The brown recluse spider (Loxosceles reclusa) has been recognized as a cause of necrotizing bites since at least 1957, but most of the literature consists of laboratory studies using animals, human sera, or case reports of more dramatic examples of bite reactions.
Brown recluse spider (Loxosceles recluse) venom phospholipase D (PLD) generates lysophosphatidic acid (LPA).
In North America, once they were determined to be a public health threat, there was great interest in defining the distribution of the brown recluse spider, L.
Baker said if anything should be of concern, it's the violin spider or brown recluse spider, which her company sees more of in Santa Clarita.