book lung

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English[edit]

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Noun[edit]

book lung (plural book lungs)

  1. (zoology) A lamellate respiratory organ found in arachnids.
    • 1996: In addition to book lungs most spiders also have a second respiratory system in the form of paired tracheae; Atypus has none. — Michael J. Roberts, Spiders of Britain and Northern Europe (Collins 1996, p. 16)
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