Genus of long, opaque nematodes; larval stages passed in the hemocylic cavity of insects, particularly grasshoppers, while adults are free-living in the soil. Accidental ...
Congenital lack of a part of the cranium other than the occipital bone. [ mero- + G. a- priv. + kranion, skull]
A type of anencephaly in which the brain and cranium are present in rudimentary form. [ mero- + G. an- priv. + enkephalos, brain]
See m. gland. [ mero- + G. krino, to separate]
Partially diastolic; relating to a part of the diastole of the heart. [ mero- + diastole]
1. Reproduction by segmentation. 2. Cleavage of an ovum. [ mero- + G. genesis, origin]
1. The incomplete development of an ovum that has been disorganized. 2. A form of asexual schizogony, typical of sporozoan protozoa, in which the nucleus divides several times ...
Partial absence of a free limb (exclusive of girdle); e.g., hemimelia, phocomelia. [ mero- + G. melos, a limb]
Abnormal smallness of some portion of the body; local dwarfism. [ mero- + G. mikros, small, + soma, body]
A subunit of the tryptic digestion of myosin; two types are produced, H-m. and L-m..
- H-m., heavy-m. one of the relatively heavy products (mol. wt. about 350,000) of the ...
A stage in the life cycle of sporozoans in which multiple asexual fission ( schizogony) occurs, resulting in production of merozoites. SEE ALSO: schizont.
A condition in which the perception of certain odors is wanting; analogous to color blindness. [ mero- + G. osme, smell]
A cylindrical small sporangium containing few spores and found in certain Zygomycetes. [G. meros, part, + sporangium]
Partially systolic; relating to a portion of the systole of the heart. [ mero- + systole]
The procedure of cutting into parts, as the cutting of a cell into separate parts to study their capacity for survival and development. [ mero- + G. tome, incision]
The motile infective stage of sporozoan protozoa that results from schizogony or a similar type of asexual reproduction; e.g., endodyogeny or endopolygeny. Merozoites form ...
In microbial genetics, an organism that, in addition to its own original genome (endogenote), contains a fragment ( exogenote) of a genome from another organism; the relatively ...
The racemic mixture of melphalan and medphalan; an antineoplastic agent. SYN: sarcolysine.
Acronym for myoclonic epilepsy with ragged red fiber myopathy. One of the mitochondrial disorders, this condition is caused by a point mutation of the mitochondria genome locus ...
R. Bruce, U.S. biochemist and Nobel laureate, *1921. See M. synthesis.
Katharine K., U.S. pediatrician, *1886. See Kasabach-M. syndrome.
Sodium salt of (3-hydroxymercuric-2-methoxypropyl)salicylamide-O-acetic acid; a mercurial diuretic. SYN: mercuramide.
- m. acid a mixture of ...
Jean, French anatomist, 1645–1722. See M. gland.
Ludwig, German physician in Argentina, 1875–1942. See M.- Pelizaeus disease, Pelizaeus-M. disease.
Passing or extending toward the median plane of the body or of a part. SYN: mesiad. [G. mesos, middle, + L. ad, to]
Rarely used term referring to the median plane of the body or a part. [G. mesos, middle]
Minot′s term for a primitive, “wandering” cell derived from mesoderm, probably a hemocytoblast. [ mes- + G. amoibe, change (ameba), + eidos, resemblance]
A central part of the renal glomerulus between capillaries; mesangial cells are phagocytic and for the most part separated from capillary lumina by endothelial cells. [ mes- + ...
Inflammation of the middle or muscular coat of the aorta. [ mes- + aortitis]
SYN: mesenteric. [G. mesaraion, mesentery, fr. mesos, middle, + araia, flank, belly]
Inflammation of the middle (muscular) coat of an artery. [ mes- + arteritis]
SYN: mesocephalic. [G. mesatos, midmost, + kephale, head]
Denoting an individual with a pelvic index between 90 and 95; the superior strait has a round appearance, with the transverse diameter longer than the anteroposterior by 1 cm or ...
The plasma membrane of the neurolemma that is folded in to surround a nerve axon. In electron micrographs this double layer resembles a mesentery in appearance.
The dried slices of the cactus Lophophora williamsii containing mescaline and related alkaloids.
The most active alkaloid present in the buttons of the mescal cactus, Lophophora williamsii. M. produces psychotomimetic effects similar to those produced by LSD: alteration in ...
1. Cells in the area around the dorsal lip of the blastopore where mesoderm and ectoderm undergo a process of separation. 2. That part of the mesenchyme derived from ectoderm, ...
That part of the brainstem developing from the middle of the three primary cerebral vesicles of the embryo (the caudal of these being the rhombencephalon or hindbrain, the ...
1. The sectioning of any structure in the midbrain, especially of the spinothalamic tracts for the relief of intractable pain or the cerebral peduncle for dyskinesias. 2. A ...
1. An aggregation of mesenchymal or fibroblastlike cells. 2. Primordial embryonic connective tissue consisting of mesenchymal cells, usually stellate in form, supported in ...
Rarely used term for a neoplasm in which there is a mixture of mesenchymal derivatives, other than fibrous tissue. A benign m. may contain foci of vascular, muscular, adipose, ...
Relating to the mesentery. SYN: mesareic, mesaraic.
One of the large veins which return blood from the intestines. The inferior (lower) mesenteric vein empties into the splenic vein. The superior (upper) mesenteric vein then ...
A small mesentery, as one of an intestinal diverticulum. SYN: mesoenteriolum. [Mod. L. dim. of mesenterium, mesentery]
- m. processus vermiformis SYN: mesoappendix.
Fixation or attachment of a torn or incised mesentery. SYN: mesopexy. [ mesentery + G. pexis, fixation]
Suture of the mesentery. SYN: mesorrhaphy. [ mesentery + G. rhaphe, suture]
Reducing redundancy of a mesentery by making one or more tucks in it. [ mesentery + L. plico, pp. -atus, to fold]
SYN: mesentery, mesentery. [Mod. L.]
- m. dorsale commune SYN: mesentery (2).
The midportion of the insect alimentary canal and site of digestion; the m. may possess anterior finger-like projections, the gastric ceca, and a tubular anterior midgut, ...
A fold of tissue which attaches organs to the body wall. The word mesentery usually refers to the small bowel mesentery which anchors the small intestine to the back of the ...
- trabecular m. SYN: trabecular tissue of sclera.
SYN: proximal. [G. mesos, middle]
Mesial (especially in dentistry). [G. mesos, middle]
Denoting the angle formed by the junction of the mesial and occlusal surfaces of a bicuspid or molar tooth.
Relating to the mesial and buccal surfaces of a tooth; denoting especially the angle formed by the junction of these two surfaces.
Relating to the angle formed by the junction of the mesial, buccal, and occlusal surfaces of a bicuspid or molar tooth.
Relating to the angle denoting the junction of mesial, buccal and pulpal surfaces in a tooth cavity preparation.
1. Relating to the line angle of a cavity preparation at the junction of the mesial and cervical walls. 2. Pertaining to the area of a tooth at the junction of the mesial ...
A malocclusion in which the mandibular arch articulates with the maxillary arch in a position mesial to normal; in Angle classification, a Class III malocclusion. SYN: mesial ...
A supernumerary tooth located in the midline of the anterior maxillae, between the maxillary central incisor teeth. [ mesio- + L. dens, tooth]
Denoting the plane or diameter of a tooth cutting its mesial and distal surfaces.
Denoting three-surface cavity or cavity preparation or restoration (class 2, Black classification) in the premolars (bicuspids) and molars.
Relating to the angle formed by the junction of the mesial surface with the gingival line of a tooth.
Denoting malposition of one or both jaws forward from their normal position.
Relating to the mesial and incisal surfaces of a tooth; denoting the angle formed by their junction.
Relating to the mesial and labial surfaces of a tooth; denoting especially the angle formed by their junction.
Relating to the mesial and lingual surfaces of a tooth; denoting especially the angle formed by their junction.
Denoting the angle formed by the junction of the mesial, lingual, and occlusal surfaces of a bicuspid or molar tooth.
Relating to the angle denoting the junction of the mesial, lingual, and pulpal surfaces in a tooth cavity preparation.
Pertaining to the inner wall or floor of a cavity preparation on the mesial side of a tooth.
Malposition of a tooth mesial to normal, in an anterior direction following the curvature of the dental arch. SYN: mesial displacement, mesioplacement.
F. A., Austrian physician, 1733–1815. See mesmerism.
A system of therapeutics from which were developed hypnotism and therapeutic suggestion. [F.A. Mesmer, Austrian physician, 1734–1815]
Obsolete term for hypnotize. [see mesmerism]
1. Middle, mean, intermediacy. 2. A mesentery, mesentery-like structure. 3. A prefix denoting a compound, containing more than one chiral center, having an internal plane of ...
An isomer of cystine in which the configuration about one of the α-carbons is d, about the other, l, so that the molecule as a whole possesses a plane of symmetry and is ...
1. Generic term for any isomer of m.inositol in which the hydroxyl groups are so arranged that the molecule as a whole possesses a plane of symmetry and is optically inactive. ...
A broad, stocky individual. [meso- + G. on, being, + morphe, form]
The short mesentery of the appendix lying behind the terminal ileum, in which the appendicular artery courses. SYN: mesenteriolum processus vermiformis, mesentery of ...
A reduced mesobilirubin with no double bonds between the pyrrole rings and, consequently, colorless. SEE ALSO: bilirubinoids. SYN: mesobilirubinogen, urobilinogen IXα.
A compound differing from bilirubin only in that the vinyl groups of bilirubin are reduced to ethyl groups. SEE ALSO: bilirubinoids.
SYN: mesoderm. [meso- + G. blastos, germ]
All the cells collectively which constitute the early undifferentiated mesoderm. [meso- + G. blastema, a sprout]
1. Atypical position of the heart in a central position in the chest, as in early embryonic life. 2. Plural of mesocardium. [meso- + G. kardia, heart]
The double layer of splanchnic mesoderm supporting the embryonic heart in the pericardial cavity. It disappears before birth. [meso- + G. kardia, heart]
- dorsal m. the part of ...
Part of the mesocolon, supporting the cecum, that occasionally persists when the ascending colon becomes retroperitoneal during fetal life. SYN: mesentery of cecum. [meso- + ...
Having a head of medium length; denoting a skull with a cephalic index between 75 and 80 and with a capacity of 1350 to 1450 ml, or an individual with such a skull. SYN: ...
Tapeworm genus found in carnivorous mammals, such as foxes; mites probably intermediate hosts; few human cases identified in Japan, the United States, and China.
The fold of peritoneum attaching the colon to the posterior abdominal wall; ascending m. [TA] (m. ascendens [TA]), transverse m. [TA] (m. transversum [TA]), descending m. [TA] ...
An operation for shortening the mesocolon, for correction of undue mobility and ptosis. SYN: mesocoloplication. [meso- + G. kolon, colon, + pexis, fixation]
SYN: mesocolopexy. [meso- + G. kolon, colon, + L. plico, pp. -atus, to fold]
A fold of amnion that sometimes binds a segment of the umbilical cord to the placenta.
The middle of the three primary germ layers of the embryo (the others being ectoderm and endoderm); m. is the origin of connective tissues, myoblasts, blood, the cardiovascular ...
Having teeth of medium size; denoting a skull with a dental index between 42 and 43.9. [meso- + G. odous, tooth]
An occasional fold of the tunica vaginalis binding the epididymis to the testis. [meso- + epididymis]
In the embryo, the mesentery of the dilated portion of the enteric canal that is the future stomach; it gives rise to the greater omentum and consequently is involved in the ...
Denoting the virulence of a virus capable of inducing lethal infection in embryonic hosts, after a short incubation period, and an inapparent infection in immature and adult ...
Neuroglial cells of mesodermal origin. SEE ALSO: microglia. SYN: mesoglial cells. [meso- + G. glia, glue]
1. Relating to the mesognathion. 2. SYN: mesognathous.
The lateral segment of the premaxillary or incisive bone external to the endognathion. [meso- + G. gnathos, jaw]
Having a face with slightly projecting jaw, one with a gnathic index from 98 to 103. SYN: mesognathic (2).
Obsolete term for corpus callosum. [meso- + L. lobus, lobe]
A mononuclear leukocyte of medium size, probably a lymphocyte, with a deeply staining nucleus of large size but relatively smaller than that in most lymphocytes. [meso- + ...
The condition of having abnormally short forearms and lower legs. [meso- + G. melos, limb]
Pertaining to the middle segment of a limb.
1. A blastomere of a size intermediate between a macromere and a micromere. 2. The zone between an epimere and a hypomere. [meso- + G. meros, part]
Displacement or delocalization of electrons within a molecule in such a way as to create fractional charges on different parts of the molecule; resonance.
The broad ligament of the uterus, below the mesosalpinx. [meso- + G. metra, uterus]
A constitutional body type or build ( biotype or somatotype) in which tissues that originate from the mesoderm prevail; from the morphological standpoint, there is a balance ...
An elementary particle having a rest mass intermediate in value between the mass of an electron and that of a proton. [G. neuter of mesos, middle]
Obsolete term for a relatively rare malignant neoplasm of the ovary and corpus uteri, thought to originate in mesonephric structures that become misplaced in ovarian tissue ...
One of three excretory organs appearing in the evolution of vertebrates; in life forms with a metanephros, the m. is located between the regressing pronephros and the ...
Inflammation of a nerve or of its connective tissue without involvement of its sheath.
- nodular m. inflammation of the connective tissue beneath the nerve sheath, with the ...
A microorganism with an optimum temperature between 25°C and 40°C, but growing within the limits of 10°C and 45°C. [meso- + G. philos, fond]
Inflammation of the middle coat of a vein. [meso- + phlebitis]
SYN: glabella (2). [meso- + Gr. ophrys, eyebrow]
Pertaining to illumination between the photopic and scotopic ranges. [meso- + G. opsis, vision]
The reflection of pleura surrounding the root of the lung (including the pulmonary ligament inferiorly) as parietal pleura becomes continuous with the visceral pleura of the ...
Porphyrin compounds resembling the protoporphyrins except that the vinyl side chains of the latter are reduced to ethyl side chains; e.g., mesobilane.
Having a face of moderate width, i.e., with a facial index of about 90. [meso- + G. prosopon, face]
The mesentery of the embryonic lung. [meso- + L. pulmo, lung]
1. In the fetus, a fold of tunica vaginalis testis supporting the mesonephros and the developing testis. 2. In the adult, a fold of tunica vaginalis testis between the testis ...
The peritoneal investment of the rectum, covering the upper part only.
Having a nose of moderate width. Denoting a skull with a nasal index from 47 to 51 ( Frankfort agreement) or 48 to 53 (Broca). [meso- + G. rhis (rhin-), nose]
The part of the broad ligament investing the uterine (fallopian) tube. [meso- + G. salpinx, trumpet]
An instrument for viewing objects that are larger than microscopic but cannot be seen distinctly with the naked eye. [meso- + G. skopeo, to view]
Denoting an orbital aperture with an index between 84 and 89; characteristic of the white race. [meso- + G. sema, sign]
A convoluted membranous body formed by involution of the plasma membranes of certain bacteria; it functions in cellular respiration and septum formation. [meso + G. soma, body]
Medium height. [meso- + G. soma, body]
SYN: body of sternum. [meso- + G. sternon, chest]
The synovial layers that pass from a tendon to the wall of a tendon sheath in certain places where tendons lie within osteofibrous canals. In most instances, the m. degenerates, ...
A malignant tumor of the mesothelium. The mesothelium is the thin lining on the surface of the body cavities and the organs that are contained within them. Most mesotheliomas ...
A single layer of flattened cells forming an epithelium that lines serous cavities; e.g., peritoneum, pleura, pericardium. [meso- + epithelium]
The first two disintegration products of thorium; m. 1 is 228Ra, a beta emitter with a half-life of 6.7 years, decaying into m. 2, which is 228Ac, a beta emitter with a ...
Turned toward the median plane. [meso- + G. trope, a turning]
The portion of the middle ear medial to the tympanic membrane.
Having a palatal index between 110 and 115. SYN: mesuranic. [meso- + G. ouranos, palate]
Portion of the broad ligament of the uterus that reflects onto and suspends the ovary. SYN: mesoarium. [meso- + L. ovarium, ovary]
A small phylum of about 50 species of parasites of marine invertebrates with complex life cycles. M. are classified with the Metazoa, but they are regarded by some observers as ...
1. That which carries a message. 2. Having message-carrying properties.
- first m. a hormone that binds to a receptor on the surface cell and, in so doing, communicates with ...
An androgenic steroid with anabolic properties.
The 3-methyl ether of ethynyl estradiol; an estrogen used in many oral contraceptive preparations.
A topical scabicide with antipruritic properties.
Abbreviation for metabolic equivalent.
Symbol for methionine or methionyl.
In medicine and biology, a prefix denoting the concept of after, subsequent to, behind, or hindmost. Cf.:post-. [G. after, between, over]
1. In chemistry, an italicized prefix ...
The process of using statistical methods to combine the results of different studies; systematic, organized, and structured evaluation of a problem using information, commonly ...
Rarely used term for a change of any kind in symptoms or course of a disease. [G. a passing over, change, fr. metabaino, to pass over]
Dependence of one organism on another for its existence. SEE ALSO: commensalism, mutualism, parasitism. [ meta- + G. biosis, way of life]
Relating to metabolism, the whole range of biochemical processes that occur within us (or any living organism). Metabolism consists of anabolism (the buildup of substances) and ...
Metabolic diseases, inherited
Also called inborn errors of metabolism, these are heritable (genetic) disorders of biochemistry. Examples include albinism, cystinuria (a cause of kidney stones), ...
Metabolic rate, basal
A measure of the rate of metabolism. For example, someone with an overly active thyroid will have an elevated basal metabolic rate.
A modified calorimeter for measuring the rate of basal metabolism.
The whole range of biochemical processes that occur within us (or any living organism). Metabolism consists both of anabolism and catabolism (the buildup and breakdown of ...
Metabolism, inborn error of
A heritable disorder of the biochemistry of the4 body. Examples of inborn errors of metabolism include albinism, cystinuria (a cause of kidney stones), phenylketonuria (PKU), ...
Any product or substrate (foodstuff, intermediate, waste product) of metabolism, especially of catabolism. SYN: metabolin.
- primary m. a m. synthesized in a step in primary ...
To undergo the chemical changes of metabolism.
1. Relating to the metacarpus. 2. Any one of the m. bones. See m. (bones) [I–V], under bone.
Five cylindrical bones extending from the wrist to the fingers.
Excision of one or all of the metacarpals. [ metacarpus + G. ektome, excision]
Relating to the metacarpus and the phalanges; denoting the articulations between them.
The five bones of the hand between the carpus and the phalanges. [ meta- + G. karpos, wrist]
Having the centromere about equidistant from the extremities, said of a chromosome. [ meta- + G. kentron, circle]
The post-cercarial encysted stage in the life history of a fluke, prior to transfer to the definitive host. Some cercariae attach themselves to grass or other vegetation, form ...
The larval stages of a tapeworm, including the metamorphosis of the oncosphere to the first evidence of sexuality in the adult worm, differentiation of the scolex, and ...
1. The condition in which a cell or tissue component takes on a color different from the dye solution with which it is stained. SYN: metachromatism (2). 2. A change in the ...
Denoting cells or dyes that exhibit metachromasia. SYN: metachromophil, metachromophile.
1. Any color change, whether natural or produced by basic aniline dyes. 2. SYN: metachromasia (1). [ meta- + G. chroma, color]
The process of mixing a metal mordant with a dye before applying the dye to a tissue or fabric.
Not synchronous; multiple separate occurrences, such as multiple primary cancers developing at intervals. [ meta- + G. chronos, time]
A change of color, such as occurs in certain animals, e.g., the chameleon, by expansion and contraction of chromatophores. [ meta- + G. chrosis, a coloring]
The distobuccal cusp of an upper molar tooth. [ meta- + G. konos, cone]
The mesolingual cusp of a lower molar tooth.
Inhibition of the brightness of illumination when an adjacent visual field is illuminated.
The distal intermediate cusp of an upper molar tooth. [ meta- + G. konos, a cone]
The exoerythrocytic stage that develops from merozoites formed by the first, or cryptozoite, generation; the cryptozoite and m. generations comprise the primary exoerythrocytic ...
A genus of flukes (superfamily Heterophyundea) that encyst on fish and infect various fish-eating animals, including humans. M. yokogawai, an intestinal fluke widely distributed ...
Occurring as a sequel of jaundice. [ meta- + G. ikterikos, jaundiced]
Occurring subsequent to an infection; denoting specifically a febrile condition sometimes observed during convalescence from an infectious disease.
Moving apart; the separation of the two chromatids of each chromosome and their movement to opposite poles in the anaphase of mitosis. [ meta- + G. kinesis, movement]
One of the electropositive elements, either amphoteric or basic, usually characterized by properties such as luster, malleability, ductility, the ability to conduct electricity, ...
A polymer of acetaldehyde. [ meta- + aldehyde]
Relating to, composed of, or resembling metal.
A compound of cyanogen with a metal forming an ionic radical that combines with a basic element to form a salt; e.g., potassium ferricyanide, K3Fe(CN)6.
An enzyme containing a metal (ion) as an integral part of its active structure; e.g., cytochromes (Fe, Cu), aldehyde oxidase (Mo), catechol oxidase (Cu), carbonic anhydrase ...
A type of oxidizing enzyme, containing one of the flavin nucleotides as coenzyme, plus a metal ion that is also necessary to the action; the metal may be Fe (as in succinate ...
An enzyme that contains one of the flavin nucleotides and at least one metal ion as a required part of its active structure.
Resembling a metal in at least one amphoteric form; e.g., silicon and germanium as semiconductors. [metal + G. eidos, resemblance]
Affinity for metal salts; e.g., the affinity of the cytoplasm of cells of the reticuloendothelial system for silver carbonate stain and salts of gold and iron. [ metallo- + G. ...
Morbid fear of metal objects. [G. metallon, metal, + phobos, fear]
A combination of a porphyrin with a metal, e.g., Fe (heme), Mg (as in chlorophyll), Cu (in hemocyanin), Zn.
A protein with a tightly bound metal ion or ions; e.g., hemoglobin.
A family of protein-hydrolyzing endopeptidases that contain zinc ions as part of the active structure.
- matrix m. a subfamily of endopeptidases that hydrolyze extracellular ...
Any of a group of small proteins, rich in cysteinyl residues, that is synthesized in the liver and kidney in response to the presence of divalent ions ( zinc, mercury, cadmium, ...