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arachnida in Medicine

Arachnida

(ə-răknĭ-də)
n.
  1. A class of arthropods that includes spiders, scorpions, mites, and ticks.
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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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