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Tigris

river in Turkey and Iraq, from an Iranian source akin to words for "arrow," probably in reference to the swiftness of its current. Compare Old Persian tigra- "sharp, pointed," Avestan tighri- "arrow."

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Definitions of Tigris from WordNet

Tigris (n.)
an Asian river; a tributary of the Euphrates River;
Synonyms: Tigris River
From wordnet.princeton.edu