Matching Words
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Mesophloeum
- - The middle bark of a tree; the green layer of bark, usually soon covered by the outer or corky layer, and obliterated.
Mesophyllum
- - The parenchyma of a leaf between the skin of the two surfaces.
Mesophyrons
- 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
Mesopodiale
- - One of the bones of either the carpus or tarsus.
Mesopotamia
- noun - the land between the Tigris and Euphrates; site of several ancient civilizations; part of what is now known as Iraq
Mesoscapula
- - A process from the middle of the scapula in some animals; the spine of the scapula.
Mesospheres
- noun - the atmospheric layer between the stratosphere and the thermosphere
Mesosternal
- - Of or pertaining to the mesosternum.
Mesothelium
- noun - epithelium originating in the embryonic mesoderm; lines the primordial body cavity
Mesothorium
- - a radioactive isotope of radium (radium-228) with a half-life of 5.8 years. Also called mesothorium-1 or mesothorium I to distinguish it from a subsequent decay product, mesothorium II (actinium-228). It was discovered in 1907 by Otto Hahn as a decay product of thorium (produced by decay of thorium-232). Mesothorium-1 (radium-228) in turn produces actinium-228 (mesothorium-2) as the first product of its radioactive decay, and the actinium-228 in turn decays quickly (half-life of 6 hours) to thorium-228 (which is also called radiothorium; the thorium-228 has a half-life of 1.91 years, shorter than that of the radium-228). It was discovered and named before full recognition of the nature of isotopes of the elements, and was distinguished from other variants of radium by its half-life and mode of production and decay. It was also cheaper to prepare than other short-lived radium isotopes, and was thus sold commercially, for use, e.g. in making watch dials readable in the dark by paint