from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A word or term that appears at the top of each page or column in a reference book, such as a dictionary, to indicate the first or last entry on the page.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A watchword; a word or phrase that serves as one's guide
- n. 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
- n. Any of the words in a memo or email that define metadata regarding the message, such as sender, recipient, and subject
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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
guide + word (Wiktionary)