Definitions for "Toponymy"
(a) The science which has as its object the study of toponyms in general and of geographical names in particular. (b) The totality of toponyms in a given region.
( Gr. 'topos'=place + 'ounouma'=name) The study of the origins and meanings of place-names.
the nomenclature of regional anatomy
Keywords:  system
A system of toponyms; the use of toponyms.