encyclopedist

n. [ Cf. F. encyclopédiste. ] The compiler of an encyclopedia, or one who assists in such compilation; also, one whose knowledge embraces the whole range of the sciences. [ 1913 Webster ]

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. [ 1913 Webster ]