HyperDic: book_lung

English > 1 sense of the expression *book lung*:
NOUN	body	book lung	organ in many arachnids containing many thin folds of membrane resembling the leaves of a book

English > *book lung*: 1 sense > noun 1, body
Meaning	organ in many arachnids containing many thin folds of membrane resembling the leaves of a book.
Broader	respiratory organ	Any organ involved in the process of respiration