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Guideword

noun

Noun

1
A word or phrase that serves as one's guide.
"Naturalness is perhaps the best guideword to keep in mind."
2
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 wordnet
3
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.
"Secondly, the teacher-librarian must know how to use books herself to find information — title page, table of contents, index, guidewords, etc."
4
A word under the right-hand side of the last line on a book page that repeats the first word from the following page. historical
5
Any of the words in a memo or email that define metadata regarding the message, such as sender, recipient, and subject. uncommon
"One purpose of a traditional memo or e-mail is to provide essential information quickly and easily, so there is no restriction, other than appearance or practicality, on the number or variety of guidewords you include."

From guide + word.

Unscramble this word: guideword