toponomy top onion • toponym · · · Info · Definitions · Synonyms · Characters · · toponomy · · Text Latin · · Script 8 · · Length 4 · · Syllables Definitions · · · (noun) the nomenclature of regional anatomy. Synonyms: toponymy. · · Noun Definition 1 (noun) the branch of lexicology that studies the place names of a region or a language. Synonyms: toponymy. · · Noun Definition 2 Synonyms · · · toponymy · · Synonym 1 Characters · · m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 t latin small letter t U+0074 y latin small letter y U+0079