Abdera, a town at the mouth of the river Nestus in the S.W. of Thrace. It was first founded (B.C. 656) by Timeslus of Clazomenae, and colonised after the Persian War by the Ionian inhabitants of Teos (B.C. 544). It is famed as the birthplace of Democritus, Protagoras, Anaxarchus, and other philosophers.