Emily Dickinson Lexicon

NO'MEN-CLA-TOR, n. [L.; Fr. nomenclateur; L. nomen, name, and calo, Gr. καλεω, to call.]

1. A person who calls things or persons by their names. In Rome, candidates for office were attended each by a nomenclator, who informed the candidate of the names of the persons they met, and whose votes they wished to solicit. Cyc.
2. In modern usage, a person who gives names to things, or who settles and adjusts the names of things in any art or science.