| mesoblast | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoderm |
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| mesocarp | (noun) the middle layer of a pericarp | - |
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| mesocolon | (noun) mesentery that holds the lower colon to the dorsal abdominal wall | - |
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| mesoderm | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoblast |
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| mesohippus | (noun) North American three-toed Oligocene animal; probably not directly ancestral to modern horses | - |
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| mesomorph | (noun) a person with a well-developed muscular body | - |
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| mesomorphy | (noun) muscular and big-boned | Synonyms: athletic type |
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| meson | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: mesotron |
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| mesophyron | (noun) a smooth prominence of the frontal bone between and above the eyebrows; the most forward projecting point of the forehead in the midline at the level of the supraorbital ridges | Synonyms: glabella |
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| mesophyte | (noun) land plant growing in surroundings having an average supply of water; compare xerophyte and hydrophyte | Synonyms: mesophytic plant |
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| mesosphere | (noun) the atmospheric layer between the stratosphere and the thermosphere | - |
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| mesothelioma | (noun) a form of carcinoma of the mesothelium lining lungs or abdomen or heart; usually associated with exposure to asbestos dust | - |
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| mesothelium | (noun) epithelium originating in the embryonic mesoderm; lines the primordial body cavity | - |
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| mesotron | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: meson |
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