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In deks
parts of speech:
noun, transitive verb
Word History, Word Explorer
part of speech: noun
inflections: indexes, indices
definition: an alphabetical list of subjects, names, or other information in a book, with page numbers given for each item.
If you look up Franklin Roosevelt in the index, it will lead you to the pages where he is mentioned in the textbook.
part of speech: transitive verb
inflections: indexes, indexing, indexed
definition: to make an index of or place as part of an index.
The author indexed the book's most important information.
Word History
Index was a Latin word that came from another Latin word, indicare, which means "to point out" or "indicate." In Latin, "index" could mean "forefinger," "pointer," "list," or anything that points to something else. The index of a book points you to the places in the book you are interested in.
Word Explorer
  book, number