Encyclopedist

Webster's Dictionary

(n.) The compiler of an encyclopedia, or one who assists in such compilation; also, one whose knowledge embraces the whole range of the sciences.

The Nuttall Encyclopedia

Generally a man of encyclopedic knowledge, or who conducts or contributes to an encyclopædia; specially one who has, as the French encyclopedists, an overweening, false, and illusory estimate of the moral worth and civilising power of such knowledge. See Carlyle'S "Sartor," Bk. I. chap. 10, on the "Encyclopedic Head."