book lung

(redirected from Booklung)
Also found in: Dictionary, Thesaurus, Medical.
Related to Booklung: compound eye

book lung,

terrestrial respiratory organ characteristic of arachnids such as scorpions and primitive spiders. Each book lung consists of hollow flat plates. Air bathes the outer surface of the plates and blood circulates within them, facilitating the exchange of gases. In most species, adequate gas exchange occurs without any muscular movement to ventilate the lung.

book lung

[′bu̇k ‚ləŋ]
(invertebrate zoology)
A saccular respiratory organ in many arachnids consisting of numerous membranous folds arranged like the pages of a book.
References in periodicals archive ?
Spiderlings were covered with a fine mist and the compound was forced into the booklungs.
Area between booklungs covered with smooth orange sternite continuous with epigynum; spermathecae separated by less than their width; epigynum with median trapezoidal plate at posterior margin (Fig.