Red-book definitions

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A book, often bound with a red cover, or online equivalent, that is an official, or canonical, collection of data, regulations, or writings.
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A book supposedly belonging to the devil and containing the signatures of those in league with him.
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Origin of red-book

red + book as a fixed title for various official books from the 15th century, especially the Red Book of the Exchequer, a manuscript volume of the 13th century (OED).