English

Alternative forms

• book-lung

Noun

book lung ‎(plural book lungs)

1. (arachnology) 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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