Metrodorus of Chios (Greek: Μητρόδωρος ὁ Χῖος; fl. 4th century BC) was a Greek philosopher, belonging to the school of Democritus, and an important forerunner of Epicurus.Metrodorus was a pupil of Nessus of Chios, or, as some accounts prefer, of Democritus himself. He is said to have taught Diogenes of Smyrna, who, in turn, taught Anaxarchus.The following quote is attributed to him. If accurate, it demonstrates that Metrodorus had a cosmological philosophy that was advanced for the ancient world: "A single ear of wheat in a large field is as strange as a single world in infinite space."