Source : Webster's Revised Unabridged Dictionary (1913)

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.

   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.

   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.