One of the mysteries of the English language finally explained.
(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.’
- ‘A researcher at the University of Manchester has reported finding slit-like structures and book lungs on some eurypterid fossils.’
- ‘Respiration takes place through the body surface, and/or by means of gills, tracheae, or book lungs.’
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