From BiblePortal Wikipedia

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [1]

the founder of the atomistic school of Grecian philosophy, and forerunner of Democritus (q.v.). Nothing is known concerning him, neither the time nor the place of his birth, nor the circumstances of his life.

The Nuttall Encyclopedia [2]

A Greek philosopher of the 6th century B.C., the founder of the Atomic theory of things, of which Democritus ( q. v .) was the chief expounder.