brown recluse
US /ˌbraʊn rɪˈkluːs/
UK /ˌbraʊn rɪˈkluːs/
1.
a venomous spider (Loxosceles reclusa) native to the central and southern United States, known for a violin-shaped marking on its back and a bite that can cause necrotic lesions.
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Be careful when cleaning out old sheds; you might encounter a brown recluse.
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The bite of a brown recluse can cause a painful, slow-healing wound.