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book lung

the respiratory organ of a spider, scorpion, or other arachnid, composed of thin, membranous structures arranged like the leaves of a book.
Origin of book lung
1895-1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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book-lung in Science
book lung
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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