guideword

1. A word or phrase that serves as one's guide.

2. A word that is printed at the top or bottom of the page in a reference work, in order to help readers find a specific entry.

   a word printed at the top of the page of a dictionary or other reference book to indicate the first or last item on that page

3. (historical)A word under the right-hand side of the last line on a book page that repeats the first word from the following page.

4. (uncommon)Any of the words in a memo or email that define metadata regarding the message, such as sender, recipient, and subject.

regular

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