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Mesembryanthemum

A genus of herbaceous or suffruticose plants, chiefly natives of South Africa. The leaves are opposite, thick, and fleshy. The flowers usually open about midday, whence the name.

Mesencephalon

The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See Brain.

Mesenchyma

The part of the mesoblast which gives rise to the connective tissues and blood.

Mesenteron

All that part of the alimentary canal which is developed from the primitive enteron and is lined with hypoblast. It is distinguished from the stomodaeum, a part at the anterior end of the canal, including the cavity of the mouth, and the proctodaeum, a part at the posterior end, which are formed by invagination and are lined with epiblast.

Mesethmoid

Of or pertaining to the middle of the ethmoid region or ethmoid bone. The median vertical plate, or median element, of the ethmoid bone.

Mesh

To engage with each other, as the teeth of wheels.

Meshy

Formed with meshes; netted.

Mesiad

Toward, or on the side toward, the mesial plane; mesially; -- opposed to laterad.

Mesial

Middle; median; in, or in the region of, the mesial plane; internal; -- opposed to lateral.

Mesially

In, near, or toward, the mesial plane; mesiad.

Mesityl

A hypothetical radical formerly supposed to exist in mesityl oxide.

Mesitylene

A colorless, fragrant liquid, C6H3(CH3)3, of the benzene series of hydrocarbons, obtained by distilling acetone with sulphuric acid.

Mesitylol

A crystalline substance obtained from mesitylene.

Mesmeree

A person subjected to mesmeric influence; one who is mesmerized.

Mesmerism

An earlier name for hypnosis or hypnotism, the art of inducing an extraordinary or abnormal state of the nervous system, in which the actor claims to control the actions, and communicate directly with the mind, of the recipient. It is believed to be a state between sleep and wakefulness, in which a person is more susceptible to suggestion than when awake. See Animal magnetism, under Magnetism.

Mesmerist

One who practices, or believes in, mesmerism.

Mesmerization

The act of mesmerizing; the state of being mesmerized.

Mesmerize

To bring into a state of mesmeric sleep; to hypnotize.

Mesne

Middle; intervening; as, a mesne lord, that is, a lord who holds land of a superior, but grants a part of it to another person, in which case he is a tenant to the superior, but lord or superior to the second grantee, and hence is called the mesne lord.

Mesoarium

The fold of peritoneum which suspends the ovary from the dorsal wall of the body cavity; the mesovarium.

Mesoblast

The mesoderm. The cell nucleus; mesoplast.

Mesoblastic

Relating to the mesoblast; as, the mesoblastic layer.

Mesobranchial

Of or pertaining to a region of the carapace of a crab covering the middle branchial region.

Mesocaecum

The fold of peritoneum attached to the caecum.

Mesocarp

The middle layer of a pericarp which consists of three distinct or dissimilar layers.

Mesocephalic

Of or pertaining to, or in the region of, the middle of the head; as, the mesocephalic flexure. Having the cranial cavity of medium capacity; neither megacephalic nor microcephalic. Having the ratio of the length to the breadth of the cranium a medium one; mesaticephalic.

Mesocolon

The fold of peritoneum, or mesentery, attached to the colon.

Mesocoracoid

A process from the middle of the coracoid in some animals.

Mesoderm

The layer of the blastoderm, between the ectoderm and endoderm; mesoblast. See Illust. of Blastoderm and Ectoderm. The middle body layer in some invertebrates. The middle layer of tissue in some vegetable structures.

Mesodermal

Pertaining to, or derived from, the mesoderm; as, mesodermal tissues.

Mesogaster

The fold of peritoneum connecting the stomach with the dorsal wall of the abdominal cavity; the mesogastrium.

Mesogloea

A thin gelatinous tissue separating the ectoderm and endoderm in certain coelenterates.

Mesognathous

Having the jaws slightly projecting; between prognathous and orthognathous. See Gnathic index, under Gnathic.

Mesohepar

A fold of the peritoneum connecting the liver with the dorsal wall of the abdominal cavity.

Mesohippus

An extinct mammal of the Horse family, but not larger than a sheep, and having three toes on each foot.

Mesolabe

An instrument of the ancients for finding two mean proportionals between two given lines, required in solving the problem of the duplication of the cube.

Mesolite

A zeolitic mineral, grayish white or yellowish, occuring in delicate groups of crystals, also fibrous massive. It is a hydrous silicate of alumina, lime, and soda.

Mesometrium

The fold of the peritoneum supporting the oviduct.

Mesomycetes

One of the three classes into which the fungi are divided in Brefeld's classification.

Mesomyodous

Having the intrinsic muscles of the larynx attached to the middle of the semirings.

Meson

The mesial plane dividing the body of an animal into similar right and left halves. The line in which it meets the dorsal surface has been called the dorsimeson, and the corresponding ventral edge the ventrimeson.

Mesonasal

Of or pertaining to the middle portion of the nasal region.

Mesonephric

Of or pertaining to the mesonephros; as, the mesonephric, or Wolffian, duct.

Mesonephros

The middle one of the three pairs of embryonic renal organs developed in most vertebrates; the Wolffian body.

mesonic

Of or pertaining to a meson.

Mesonotum

The dorsal portion of the mesothorax of insects.

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.

Mesopodial

Of or pertaining to the mesopodialia or to the parts of the limbs to which they belong.

Mesopodiale

One of the bones of either the carpus or tarsus.

Mesopodium

The middle portion of the foot in the Gastropoda and Pteropoda.

Mesopterygium

The middle one of the three principal basal cartilages in the fins of fishes.

Mesorchium

The fold of peritoneum which attaches the testis to the dorsal wall of the body cavity or scrotal sac.

Mesorectum

The fold of peritoneum, or mesentery, attached to the rectum.

Mesorhine

Having the nose of medium width; between leptorhine and platyrhine.

Mesoscapula

A process from the middle of the scapula in some animals; the spine of the scapula.

Mesoscutum

The scutum or dorsal plate of the middle thoracic segment of an insect. See Illust. of Butterfly.

Mesoseme

Having a medium orbital index; having orbits neither broad nor narrow; between megaseme and microseme.

Mesosperm

A membrane of a seed. See Secundine.

mesotartaric

Pertaining to, or designating, an acid called also inactive tartaric acid. It is an optically inactive stereoisomer of tartaric acid due to internal compensation of the rotatory activity of the two asymmetric centers; it has a plane of symmetry in the molecule.

Mesotheca

The middle layer of the gonophore in the Hydrozoa.

Mesothelium

Epithelial mesoderm; a layer of cuboidal epithelium cells, formed from a portion of the mesoderm during the differetiation of the germ layers. It constitutes the boundary of the c/lum.

Mesothorax

The middle segment of the thorax in insects. See Illust. of Coleoptera.

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 painting the hands and hour marks with a self-luminous paint containing the radioactive substance; it is therefore often referred to (e.g. in regulatory legislation) as though distinct from radium. It was one of the isotopes believed responsible for radiation-induced diseases observed in industrial workers who painted radium on watch dials in the late 1950's and early 1960's. The primary isotope of radium (radium-226) has a half-life of 1620 years, and these isotopes with shorter half-lives proved difficult to isolate and study for the purpose of finding the cause of such diseases.

Mesotrochal

Having the middle of the body surrounded by bands of cilia; -- said of the larvae of certain marine annelids.

Mesotype

An old term covering natrolite or soda mesolite, scolecite or lime mesotype, and mesolite or lime-soda mesotype.

Mesovarium

The fold of peritoneum connecting the ovary with the wall of the abdominal cavity.

Mesoxalic

Pertaining to, or designating, an acid, CH2O2(CO2H)2, obtained from amido malonic acid.

Mesozoa

A group of very lowly organized, wormlike parasites, including the Dicyemata. They are found in cephalopods. See Dicyemata.

Mesquit Mesquite

Aany of several small spiny trees or shrubs of the southwestern part of North America belonging to the genus Prosopis having small flowers in axillary cylindrical spikes followed by large sugar-rich pods, especially the honey mesquite, and screw-pod mesquite.

Mess

To supply with a mess.

mess up

To make a mess{5} of; to confuse, disorder, or muddle; to muss; to jumble; to disturb.

mess-up

Something badly botched or muddled.

Messenger

One who bears a message; the bearer of a verbal or written communication, notice, or invitation, from one person to another, or to a public body; specifically, an office servant who bears messages.

Messiad

A German epic poem on the Messiah, by Klopstock.

Messiah

The expected king and deliverer of the Hebrews; the Savior; Christ.

Messianic

Of or relating to the Messiah; as, the Messianic office or character.

Messidor

The tenth month of the French republican calendar dating from September 22, 1792. It began June 19, and ended July 18. See Vend/miaire.

Messieurs

Sirs; gentlemen; -- abbreviated to Messrs., which is used as the plural of Mr.

Messinese

Of or pertaining to Messina, or its inhabitans.

Messuage

A dwelling house, with the adjacent buildings and curtilage, and the adjoining lands appropriated to the use of the household.

Mestee

The offspring of a white person and a quadroon; -- so called in the West Indies.

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