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Use "toponomy" in a sentence
"The Copycat Effect (NY: Simon and Schuster, 2004), and in forthcoming books, with further explorations in onomatology (the study of names) and toponomy (the study of places)."
"On the other hand, Dr. Burrill's article on "Toponomy and Cultural History" is a very good example of how toponomy (and lexicography in general) and history can benefit from each other."