book lung

noun

Definition of book lung

: a saccular breathing organ in many arachnids containing thin folds of membrane arranged like the leaves of a book

First Known Use of book lung

1881

in the meaning defined above

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Medical Dictionary

book lung

noun \ ˈbu̇k- \

medical Definition of book lung

: a saccular breathing organ in many arachnids containing thin folds of membrane arranged like the leaves of a book

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