a presocratic Greek philosopher and astronomer (who predicted an eclipse in 585 BC) who was said by Aristotle to be the founder of physical science; he held that all things originated in water (624-546 BC)
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If metaphysics is all Greek to you, review this list of terms related to ancient philosophy. You'll learn about ethics, logic, and the most important philosophical schools of thought, as well as classical philosophers from Aristotle to Zeno.