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mesopelagic

[mez-uh-puh-laj-ik, mes-, mee-zuh-, -suh-]
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adjective Oceanography.
  1. of, relating to, or living in the ocean at a depth of between 600 feet (180 meters) and 3000 feet (900 meters).
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Origin of mesopelagic

First recorded in 1945–50; meso- + pelagic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for mesopelagic

mesopelagic

adjective
  1. of, relating to, or inhabiting the intermediate depths of the ocean between approximately 100 and 1000 metres
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012