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Definition of Guideword
1. Noun. 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. 
Definition of Guideword
1. [n -S]
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1. Noun. 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. 
1. [n -S]