One of the two major rivers of ancient Mesopotamia, flowing through modern-day Iraq and Turkey, famous as part of the 'Fertile Crescent' where civilization began.
From Old Persian 'tigra' meaning 'arrow,' named for the river's swift, sharp current. The Greeks borrowed this as Tigris, and it entered English through classical texts about ancient history.
The Tigris and Euphrates rivers were the birthplace of writing, mathematics, and law—the Sumerians invented cuneiform along the Tigris around 3200 BCE, making it one of humanity's most consequential waterways.
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