/ Dictionary / Index M mesopelagic: Meaning and Definition of Find definitions for: mes•o•pe•lag•ic Pronunciation: (mez"u-pu-laj'ik, mes"-, mē"zu-, -su-), [key] — adj. Oceanog. of, pertaining to, or living in the ocean at a depth of between 600 ft. (180 m) and 3000 ft. (900 m). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mesopeak mesophile Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language