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From The Collaborative International Dictionary of English v.0.48:
Nomenclator \No"men*cla`tor\, n. [L., fr. nomen name + calare to call. See Name, and Calendar.] 1. One who calls persons or things by their names. [1913 Webster] Note: In Rome, candidates for office were attended each by a nomenclator, who informed the candidate of the names of the persons whom they met and whose votes it was desirable to solicit. [1913 Webster] 2. One who gives names to things, or who settles and adjusts the nomenclature of any art or science; also, a list or vocabulary of technical names. [1913 Webster]