- book lung
- nounorgan in many arachnids containing many thin folds of membrane resembling the leaves of a book• Hypernyms: ↑respiratory organ
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noun: a saccular breathing organ occurring in many arachnids that contains numerous thin folds of membrane arranged like the leaves of a book through which gaseous exchange takes place* * *
the respiratory organ of a spider, scorpion, or other arachnid, composed of thin, membranous structures arranged like the leaves of a book.[1895-1900]* * *
book lung nounThe respiratory organ in spiders and other arachnids, formed of fine membranes like the leaves of a book• • •Main Entry: ↑book* * *
book lung,a breathing organ of some arachnids consisting of small sacs within the abdomen, connected with the outer air by small openings. Within each sac are many layers of tissue containing many blood vessels arranged like the leaves of a book.* * *
n. Zoology (in a spider or other arachnid) each of a pair of respiratory organs composed of many fine leaves. They are situated in the abdomen and have openings on the underside
Useful english dictionary. 2012.