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Latrodectus

(lăt′rə-dĕktəs)
n.
  1. A genus of small spiders, including the black widow, capable of inflicting highly poisonous, neurotoxic bites.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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