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

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