Definitions for "Book lung"
A set of soft overlapping flaps, covered up by a plate on the abdomen, through which oxygen is taken up and carbon dioxide given off. Characteristic of many terrestrial arachnids such as scorpions and spiders.
a rudimentary type of lung found in arachnids, such as scorpions and spiders, and in horseshoe crabs
respiratory organ in many arachnids consisting of many thin folds of membrane resembling the leaves of a book.