A diversion used to pass the time while waiting for the computer repairman to come.

A published set of printed pages that are fastened together inside a cover, which may contain a story, information, poems, or other forms of writing presentations:

The breathing area in some arachnids, resembling a book lung but on the outside of the body.

The "book lung" is the breathing organ in spiders and other arachnids, with membranous tissue arranged in folds that resemble the leaves of a book.

A terrestrial respiratory organ characteristic of arachnids; such as, scorpions and primitive spiders.

Each book lung consists of hollow flat plates and air goes over the outer surface of the plates and bodily fluid circulates within them, facilitating the exchange of gases.

In most species, adequate gas exchange occurs without any muscular movement to ventilate the lungs.

McGraw-Hill, Inc.; New York; 1992.