mesocephˈalism or mesocephˈaly noun

mesˈoderm noun

(Gr derma skin) the layer of embryonic cells between the ectoderm and the endoderm in a gastrula

mesodermˈal adjective

mesogasˈtric adjective

mesogasˈtrium noun (pl mesogasˈtria)

The region of the abdomen between the epigastrium and the hypogastrium

mesogloea /-glēˈə/ noun

(Gr gloiā glue) in coelenterates and sponges, a structureless gelatinous layer between ectoderm and endoderm

mesohippˈus noun

One of the prehistoric group of three-toed ungulate mammals probably related to the modern horse

mesˈolite noun

(Gr lithos stone) a zeolite intermediate in composition between natrolite and scolecite

Mesolithˈic adjective

Intermediate between Palaeolithic and Neolithic

mesomˈerism noun (chem)

1. Resonance
2. A type of tautomerism

mesˈomorph /-mörf/ noun

(Gr morphē form) a person of muscular bodily type, thought to correspond to a characteristically aggressive and extroverted personality type (see ectomorph under ecto- and endomorph under endo-)

mesomorˈphic or mesomorˈphous adjective

1. Relating to a mesomorph
2. Relating to an intermediate state of matter between solid and liquid (chem)

mesˈomorphy noun

mesˈopause noun

The upper boundary of the mesosphere, the coldest region of the atmosphere

mesopelagic /-pi-lajˈik/ adjective

(Gr pelagos sea) relating to the intermediate regions between the surface and depths of the ocean

mesˈophyll noun

(Gr phyllon leaf) the spongy tissue within a leaf

mesˈophyte /-fīt/ noun

(Gr phyton plant) a plant intermediate between a xerophyte and a hydrophyte

mesophytic /-fitˈik/ adjective

mesˈoscaphe /-skāf/ noun

(Gr skaphos ship) a submersible observation chamber for use at less great depths than the bathyscaphe

mesˈosphere noun

The region of the earth's atmosphere above the stratosphere and below the thermosphere

mesospherˈic /-sferˈik/ adjective

mesothēˈlial adjective

mesothēliōˈma noun

(from epithelium and -oma) a malignant tumour of the lining of the chest or abdomen, often caused by asbestos dust

mesothēˈlium noun (pl mesothēˈlia)

The cell tissue that forms the lining of the chest and abdomen in vertebrates and lines the body-cavity in vertebrate embryos

mesotherˈapy noun (medicine)

The treatment of a specific area of the body by injecting a substance into the mesoderm

mesothoracic /-thö- or -thō-rasˈik/ adjective

mesothorˈax noun

The middle one of the three segments of an insect's thorax

Mesozōˈa plural noun

(Gr zōion animal) minute animals once thought intermediate between Protozoa and Metazoa, prob Metazoa reduced by parasitism

Mesozōˈic adjective (Gr zōē life; geology)

Of or belonging to the middle era of the Phanerozoic eon, between 250 and 65 million years ago (also noun)