guide word (noun)

1. The guide word 'A' is printed at the top of the page to indicate the first item on that page in a dictionary of architectural terms.

2. In an art reference book, the guide word 'Still Life' is printed at the top of the page to indicate the last item on that page.

3. The guide word 'World War' is printed at the top of the page to indicate the first item on that page in a history encyclopedia.

4. At the top of the page of a fashion magazine, the guide word 'Zebra print' is printed to indicate the last item on that page.