Definition of "blue book" [blue• book]

• An official list of persons in the employ of the U.S. government. (noun)
• A book listing the names of socially prominent people. (noun)
• A blank notebook with blue covers in which to write the answers to examination questions. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Secret door behind shelves by fire-place-Hyook pull big blue book on third shelf to open. ""
• "Justin Kloster looked from his blue book to his watch and back again."
• "I talked to Albert's uncle about it one day, when the others had gone to church, and I did not go because of earache, and he said it came from reading the wrong sort of books partly – she has read Ministering Children, and Anna Ross, or The Orphan of Waterloo, and Ready Work for Willing Hands, and Elsie, or Like a Little Candle, and even a horrid little blue book about the something or other of Little Sins."