Breadcrumb Home > Dictionary > Index M meso-: Meaning and Definition of Find definitions for: meso- Pronunciation: [key] a combining form meaning “middle,” used in the formation of compound words: mesocephalic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mesne lord Mesoamerica TrendingHere are the facts and trivia that people are buzzing about. The Book of 1 Corinthians: Summary Current Events This Week: June 2023 Languages Spoken in Each Country of the World Aesop's Fables: Aesop's Fables Milestones in Environmental Protection The 12 Labors of Hercules (In Order) ✖ Related Content Daily Word Quiz: spelunk Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language