(arachnology) A lamellate respiratory organ found in arachnids.

(colloquial, with regard to income) Undeclared for tax and social insurance etc.

(theater) Able to perform scripted material from memory, without need to refer to the text. / (accounting) Off the books, not officially recorded.

The Bible, or by extension the scripture of another religion.

plural of guide book

(transitive, idiomatic, informal) To charge with or convict of as many crimes as possible. / (transitive, idiomatic, informal) To apply the harshest possible punishment to.

plural of absey book

(obsolete) An ABC book; abecedary; a primer.

(accounting) A book in which accounts are kept; ledger.

A small book for keeping other people's addresses and phone numbers. / (computing) A computerized storage area for contact information such as e-mail addresses.