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Democritus (Greek Philosopher)
Democritus was a pre-Socratic Greek materialist philosopher . Democritus was a student of Leucippus and co-originator of the belief that all matter is made up of various imperishable, indivisible elements which he called atoma or "indivisible units", from which we get the English word atom. It is virtually impossible to tell which of these ideas were unique to Democritus and which are attributable to Leucippus.