The Collaborative International Dictionary of English v.0.48:
Toponomy \To*pon"o*my\, n. [Gr. ? place + ? to distribute.] The designation of position and direction. --B. G. Wilder. [1913 Webster]WordNet (r) 3.0 (2006):
toponomy 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]