(In a spider or other arachnid) each of a pair of respiratory organs composed of many fine leaves. They are situated in the abdomen and have openings on the underside.
- 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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