guideword

guide·word  (gdwûrd)

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.

Thesaurus

Noun

1.

guideword - 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, catchword word - a unit of language that native speakers can identify; "words are the blocks from which sentences are made"; "he hardly said ten words all morning"