gazetteer a gazetteer is a book which alphabetically names and describes the places in a specific area. For example, a gazetteer of a county would name and describe all of the towns, lakes, rivers, and mountains in the county. gdn. guardian. GEDCOM Database GEnealogy Data COMmunications, a standardized format for genealogy databases that allows the exchange of data among different software programs and operating systems. genealogy study of one's ancestry; summary history or table of a person's ancestry. good brother brother-in-law. good sister sister-in-law. good son son-in-law. grandam grandmother. grantee person purchasing, buying or receiving property. grantee index master index of persons purchasing, buying or receiving property. grantor person selling, granting, transfering or conveying property. grantor index master index of persons selling, granting, transfering or conveying property. grdn. (abbreviation) guardian. guardian person lawfully appointed to care for the person of a minor, invalid, incompetent and their interests, such as education, property management and investments.