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Clazomenae (kləzŏm´Ĭnē), ancient city of W Asia Minor, 20 mi (32 km) W of present-day Izmir, Turkey. It was one of the 12 Ionian cities of Asia Minor. The city was founded on the mainland but was later moved to a small island, and Alexander the Great built a causeway to it. The town continued to flourish through the Hellenistic and Roman periods. It was the birthplace of the philosopher Anaxagoras.