The Collaborative International Dictionary of English v.0.48:
Toponymy \To*pon"y*my\, n. A system of toponyms; the use of toponyms. -- To*pon"y*mal, Top`o*nym"ic, Top`o*nym"ic*al, a. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
toponymy n 1: the nomenclature of regional anatomy [syn: toponymy, toponomy] 2: the branch of lexicology that studies the place names of a region or a language [syn: toponymy, toponomy]