to·pon·y·my noun alsoto·pon·o·my\təˈpänəmē, tōˈ-, -mi\ (-es) Etymology:toponymy International Scientific Vocabulary top- + -onymy; toponomy from top- + Greek onoma name + English -y — more at name 1.: the place-names of a region or language or the especially etymological study of them 2.: the nomenclature of regional anatomy