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from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A lamellate respiratory organ found in arachnids.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. organ in many arachnids containing many thin folds of membrane resembling the leaves of a book


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