mesopelagic

[ mez-uh-puh-laj-ik, mes-, mee-zuh-, -suh- ]
/ ˌmɛz ə pəˈlædʒ ɪk, ˌmɛs-, ˌmi zə-, -sə- /

adjective Oceanography.

of, relating to, or living in the ocean at a depth of between 600 feet (180 meters) and 3000 feet (900 meters).

Origin of mesopelagic

First recorded in 1945–50; meso- + pelagic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for mesopelagic

mesopelagic

/ (ˌmɛsəʊpəˈlædʒɪk) /

adjective

of, relating to, or inhabiting the intermediate depths of the ocean between approximately 100 and 1000 metres
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