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book lung

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• book-lung

booklung (pluralbook lungs)

2. (arachnology) Alamellaterespiratory organ found inarachnids.
   • 1996, Michael J. Roberts,Spiders of Britain and Northern Europe, page16:

     In addition tobook lungs most spiders also have a second respiratory system in the form of paired tracheae;Atypus has none.

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