One or more words printed on the top of the page of a reference work to guide the reader in locating the word he or she is looking for. In some arrangements (as in pocket book dictionaries) the left-hand page repeats the first word on that page, and the right-hand page repeats the last word on that page. In other arrangements (such as large dictionaries with fine print) each page repeats the first and the last word(s) on that page. Also called catch word.
Use guide word in a sentence