Definitions
There is 1 meaning of the phrase
Book Lung.
Book Lung - as a noun
Organ in many arachnids containing many thin folds of membrane resembling the leaves of a book
Example Sentences
"A book lung is a respiratory organ found in some arachnids."
"Spiders use their book lungs to extract oxygen from the air."
"The scorpion's book lungs are located inside its abdomen."
"Some species of harvestmen possess book lungs."
"The structure of a book lung allows for efficient gas exchange."
