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Mariana Trench
[mair-ee-ah-nuh trench, mar-]
noun
the world’s deepest oceanic trench, a crescent-shaped depression located in the western Pacific Ocean, south and west of the Mariana Islands: site of the Challenger Deep.
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Word History and Origins
Origin of Mariana Trench1
First recorded in 1930–35; named after the Mariana Islands
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