Source : Webster's Revised Unabridged Dictionary (1913)

Encyclopedist \En*cy`clo*pe"dist\, n. [Cf. F.
   encyclop['e]diste.]
   The compiler of an encyclopedia, or one who assists in such
   compilation; also, one whose knowledge embraces the whole
   range of the sciences.

   {The Encyclopedists}, the writers of the great French
      encyclopedia which appeared in 1751-1772. The editors were
      Diderot and D'Alembert. Among the contributors were
      Voltaire and Rousseau.

Source : WordNet®

encyclopedist
     n : a person who compiles (or writes for) encyclopedias [syn: {encyclopaedist},
          {compiler}]