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book lung

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Definition of book lung in English:

noun

Zoology
(In a spider or other arachnid) each of a pair of respiratory organs composed of many fine lamellae. They are situated in the abdomen and have openings on the underside.
Example sentences
  • Most spiders breathe through tracheae; some, like the wolf spiders, have both book lungs and tracheae.
  • Like spiders, they were terrestrial and respired through book lungs, and walked on eight legs.
  • Respiration takes place through the body surface, and/or by means of gills, tracheae, or book lungs.

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