book lung

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book lung

n.
One of the paired saccular respiratory organs found in some arachnids, such as scorpions and spiders, consisting of several parallel membranous folds arranged like the pages in a book.

book′ lung`


n.
the respiratory organ of many arachnids, composed of thin, paperlike layers of tissue.
[1895–1900]

book lung

(bo͝ok)
The breathing organ of scorpions, spiders, and some other arachnids. It consists of membranes arranged in several parallel folds like the pages of a book.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.book lung - organ in many arachnids containing many thin folds of membrane resembling the leaves of a book
respiratory organ - any organ involved in the process of respiration
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References in periodicals archive ?
Layered internal mesosomal organs were located and interpreted as probable book lungs (Kuhl et al.
Some spiders have a tracheal system to deliver oxygen to their tissues, some have both tracheae and book lungs, and some have only book lungs.
In this study we hypothesized that Grammostola rosea Walckenaer 1837, an active predator of large size that depends on its two paired book lungs for respiration, would have a refined low energy strategy based on its thin air-hemolymph barrier.