Definition of book lung in English:

book lung

Syllabification: book lung

noun

Zoology
  • (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.
    More 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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Word of the day skosh
Pronunciation: skəʊʃ
noun
a small amount; a little