1. SYN: metasyphilitic (1). 2. SYN: metasyphilitic (2). 3. SYN: parasyphilitic. [ meta- + L. lues, pestilence]
1. An entity that is similar to, but ultimately differentiable from, another entity. 2. Structural isomer. [ meta- + -mer]
One of a series of homologous segments in the body. SEE ALSO: somite. [ meta- + G. meros, part]
1. Relating to or showing metamerism, or occurring in a metamere. 2. Referring to a metamer.
1. A type of anatomic structure exhibiting serially homologous metameres; in primitive forms, such as the annelids, the metameres are almost alike in structure; in vertebrates, ...
Distortion of visual images. [ meta- + G. morphe, shape, + opsis, vision]
1. A change in form, structure, or function. 2. Transition from one developmental stage to another. SYN: allaxis, transformation (1). [G. metamorphasos, transformation fr. ...
A transitional form of myelocyte with nuclear construction that is intermediate between the mature myelocyte ( myelocyte C of Sabin) and the two-lobed granular leukocyte. SYN: ...
A catabolite of epinephrine found, together with normetanephrine, in the urine and in some tissues, resulting from the action of catechol-O-methyltransferase on epinephrine; ...
Applied to the more caudal part of the intermediate mesoderm which, under the inductive action of the metanephric diverticulum, has the potency to form metanephric tubules. [ ...
The most caudally located of the three excretory organs appearing in the evolution of the vertebrates (the others being the pronephros and the mesonephros); in mammalian ...
A monoazo acid dye, C18H14N3O3SNa, used as a cytoplasmic and connective tissue stain.
The stage of mitosis or meiosis in which the chromosomes become aligned on the equatorial plate of the cell separating the centromeres. In mitosis and in the second meiotic ...
Metaphase (cell cycle)
The stage in the cell cycle (the sequence of events in the life of a cell) when a chromosome is most highly condensed (and stains most darkly in the laboratory) and so is easiest ...
A chromosome in the stage of the cell cycle (the sequence of events in the life of a cell) when a chromosome is most condensed and easiest to distinguish and so to study. ...
Metaphyseal chondrodysplasia (McKusick type)
Also known as the cartilage hair hypoplasia syndrome, this is a genetic form of short-limbed dwarfism with skeletal features that also include normal head, inability to fully ...
A conical section of bone between the epiphysis and diaphysis of long bones. [ meta- + G. physis, growth]
Abnormal transformation of an adult, fully differentiated tissue of one kind into a differentiated tissue of another kind; an acquired condition, in contrast to heteroplasia. ...
1. The stage of completed growth or development of the individual. 2. SYN: metaplasia. [G. a transformation]
The choroid plexus in the fourth ventricle of the brain. [ meta- + L. plexus, an interweaving]
SYN: mammillary process of lumbar vertebra. [ meta- + G. apophysis, a process]
Rarely used term for apertura mediana ventriculi quarti. [ meta- + G. poros, pore]
Nondescript term for a derived protein obtained by the action of acids or alkalies, soluble in weak acids or alkalies but insoluble in neutral solutions; e.g., albuminate.
A sympathomimetic bronchodilator used for the treatment of bronchospasm in asthma and chronic obstructive lung disease. It has relatively greater effect on β2-adrenergic ...
1. A systematic attempt to discern and describe what lies beyond the empirical facts and laws of psychology, such as the relations between body and mind, or concerning the ...
SYN: postfebrile. [ meta- + G. pyretos, fever]
A potent sympathomimetic amine used for the elevation and maintenance of blood pressure in acute hypotensive states and topically as a nasal decongestant.
A light-activated form of rhodopsin; m. I is formed from lumirhodopsin and is converted to m. II; m. II is the form of rhodopsin that releases all-trans-retinal.
One of the small peripheral blood vessel s between the arterioles and the true capillaries that contain scattered groups of smooth muscle fibers in their walls. [ meta- + ...
Orthochromatic normoblast. See normoblast.
- pernicious anemia type m. orthochromatic megaloblast. See megaloblast.
1. Of uncertain stability; in a condition to pass into another phase when slightly disturbed; e.g., water, when cooled below the freezing point may remain liquid but will at ...
1. The shifting of a disease or its local manifestations, from one part of the body to another, as in mumps when the symptoms referable to the parotid gland subside and the ...
Common name for members of the genus Metastrongylus or of the family Metastrongylidae.
A genus of nematode lungworms (family Metastrongylidae), the only genus in its subfamily (Metastrongylinae). The four known species are found only in pigs; transmission is by ...
1. The constitutional state due to congenital syphilis without local lesions. 2. SYN: parasyphilis.
1. Relating to metasyphilis. SYN: metaluetic (1). 2. Following or occurring as a sequel of syphilis. SYN: metaluetic (2). 3. SYN: parasyphilitic.
1. Relating to the metatarsus or to one of the m. bones. See m. (bones) [I–V], under bone. 2. Any one of the m. bones.
Pain in the forefoot in the region of the heads of the metatarsals. [ meta- + G. algos, pain]
- Morton m. SYN: Morton neuralgia.
Five cylindrical bones extending from the heel to the toes.
Excision of the metatarsus. [metarsus + G. ektome, excision]
Relating to the metatarsal bones and the phalanges; denoting the articulations between them.
The distal portion of the foot between the instep and the toes, having as its skeleton the five long bones ( metatarsal bones) articulating proximally with the cuboid and ...
The caudoventral part of the thalamus, consisting of the medial and lateral geniculate bodies. [ meta- + G. thalamos, thalamus]
1. Transfer of a pathologic product ( e.g., a calculus) from one place to another where it causes less inconvenience or injury, when it is not possible or expedient to remove it ...
An organism that requires complex organic sources of carbon and nitrogen for growth.
Denoting the ability to undertake anabolism or to obtain nourishment from varied sources, i.e., both nitrogenous and carbonaceous organic matter. [ meta- + G. trophe, ...
Denoting a reversion to a previous state. [ meta- + G. trope, a turning]
Pertaining to tissue that is formed of elements identical to those occurring in that site under normal conditions, but the various elements are not arranged in the usual normal ...
A centrally acting skeletal muscle relaxant.
The anterior of the two major subdivisions of the rhombencephalon (the posterior being the myelencephalon or medulla oblongata), composed of the pons and the cerebellum. [ ...
SYN: tympanites. [G. meteorismos, a lifting up]
Rarely used term for ill health due to climatic conditions. [G. meteora, things high in the air, + pathos, suffering]
Denoting diseases affected in their incidence by the weather. [G. meteora, things high in the air, + G. tropos, a turning]
1. The fundamental unit of length in the SI and metric systems, equivalent to 39.37007874 inches. Defined to be the length of the path traveled by light in a vacuum in ...
This hand-held device measures air flow (how fast air is blown out of the lungs). Patients can use peak-flow meters to measure their own air flow regularly. The use of a ...
Change of function. [G. meta, denoting change, + ergasia, work]
An ergot derivative with a pharmacological profile similar to methysergide; a nonselective blocker of serotonin receptors. Used as an analgesic in migraine headache. SYN: ...
Chemical prefixes usually denoting a methyl, methoxy group.
A derivative of acetylcholine; a parasympatomimetic agent used as a bronchoconstrictor in testing for bronchial hyperreactivity.
Occurs in oil from Roman camomile; used in the manufacture of methacrylate resins and plastics. SYN: methylacrylic acid.
A synthetic opiate. The most common medical use for methadone is as a legal substitute for heroin in some treatment programs for drug addiction. It is administered to ...
A synthetic narcotic drug; an orally effective analgesic similar in action to morphine but with slightly greater potency and longer duration. It produces psychic and physical ...
A sympathomimetic agent that exerts greater stimulating effects upon the central nervous system than does amphetamine (hence street name, “speed”); widely used by drug ...
The methyl derivative of androstenediol, with similar actions and uses. SYN: mestenediol.
An orally effective anabolic steroid that may promote nitrogen retention when combined with an adequate diet; in addition, it can exert typically androgenic effects. SYN: ...
CH4; an odorless gas produced by the decomposition of organic matter; explosive when mixed with 7 or 8 volumes of air, constituting then the firedamp in coal mines. SYN: marsh ...
Archaea bacteria containing Gram-negative and Gram-positive, motile or nonmotile, strictly anaerobic rods and cocci, which obtain energy either by the reduction of carbon dioxide ...
Any methane-producing bacterium of the family Methanobacteriaceae.
An H1 tihistamine. M. fumarate is administered topically on the skin; m. hydrochloride is the preferred salt for oral or parenteral use.
A sedative and hypnotic, also a drug of abuse; available as the hydrochloride.
An N-methylated derivative of barbital with anticonvulsant properties similar to those of phenobarbital; converted to barbital in the body.
A carbonic anhydrase inhibitor with uses similar to those of acetazolamide.
Abbreviation for methemoglobin.
A phenothiazine compound with antihistaminic activity; used in the treatment of various dermatoses to relieve pruritus.
An abnormal compound formed in the blood as a result of heme combining with plasma albumin.
The presence of methemalbumin in the circulating blood, indicative of intravascular hemolysis with rapid hemoglobin breakdown; found in some patients with blackwater fever or ...
A particular type of hemoglobin that is altered so that it is useless for carrying oxygen and delivering it to tissues throughout the human body. Since hemoglobin is the key ...
The presence in the blood of methemoglobin, a form of hemoglobin that is useless for carrying oxygen and delivering it to tissues throughout the human body. Since hemoglobin is ...
The presence of methemoglobin in the urine. [ methemoglobin + G. ouron, urine]
A condensation product obtained by the action of ammonia upon formaldehyde; in an acid urine, it decomposes to yield formaldehyde, a urinary antiseptic. SYN: hexamine.
- m. ...
A hexamethylenetetramine-silver complex prepared by adding silver nitrate to methenamine; a white precipitate appears in the solution which dissolves upon shaking and is stable ...
A semisynthetic penicillin salt for parenteral administration; restriction of its use to infections caused by penicillin G-resistant staphylococci is recommended; it is less ...
An antithyroid drug similar in action to propylthiouracil.
An iodine-containing radiopaque medium, CH2ISO3Na or sodium methanesulfonate, formerly used for examination of the urinary tract.
2-Amino-4-(methylthio)butyric acid; the l-isomer is a nutritionally essential amino acid and the most important natural source of “active methyl” groups in the body, hence ...
An intravenous thiobarbiturate resembling thiopental and used for the induction of anesthesia; exerts a brief effect due to rapid redistribution in the body after a single ...
A centrally acting skeletal muscle relaxant, chemically related to mephenesin carbamate; it is slower in onset of action but of longer duration, and may be administered ...
The mode or manner or orderly sequence of events of a process or procedure. SEE ALSO: fixative, operation, procedure, stain, technique. [G. methodos; fr. meta, after, + hodos, ...
Also known as fertility awareness, natural family planning, and periodic abstinence, this approach to contraception entails not having sexual intercourse on the days of a ...
The scientific study or logical analysis of methods.
An ultra-short-acting barbiturate used intravenously for induction and for general anesthesia of short duration.
See dextromethorphan hydrobromide, levorphanol tartrate.
An antihypertensive agent similar in its actions to reserpine.
A folic acid antagonist used as an antineoplastic agent; used to treat psoriasis and rheumatoid arthritis. SYN: amethopterin.
A methoxypsoralen derivative that increases melanin production in the skin when exposed to ultraviolet light; used orally and topically in the treatment of idiopathic vitiligo, ...
Chemical prefix denoting substitution of a methoxyl group.
An insecticide resembling DDT; ectoparasiticide.
A potent inhalation anesthetic no longer in use because of high-output renal failure caused by increased plasma concentrations of inorganic fluoride, a metabolic breakdown ...
A parasympatholytic drug similar to atropine; the methyl nitrate has the same action and uses.
An antiepileptic effective against petit mal and psychomotor epilepsy; similar to ethosuximide.
An orally effective diuretic and antihypertensive agent of the thiazide group.
The moiety, —CH3. [G. methy, wine, + hyle, wood]
- active m. a m. group attached to a quaternary ammonium ion or a tertiary sulfonium ion that can take part in ...
A sulfonated triphenylrosaniline dye used as a stain for cytoplasm, collagen, and Negri bodies, and as an antiseptic.
Used in ionization chambers; for degreasing wool; extracting oils from nuts, seeds, flowers; used as an insect fumigant for mills, warehouses, vaults, ships, freight cars; ...
A basic triphenylmethane dye used as a chromatin stain and, in combination with pyronin, for differential staining of RNA (red) and DNA (green); also used as a tracking dye for ...
A weakly acid dye used as a pH indicator (red at 3.2, yellow at 4.4). SYN: helianthine.
A weakly acid dye used as a pH indicator (red at 4.8, yellow at 6.0); easily reduced with loss of color, and pH readings must be made rapidly.
The methyl ester of salicylic acid, produced synthetically or distilled from Gaultheria procumbens (family Ericaceae) or from Betula lenta (family Betulaceae); used externally ...
Mixtures of tetra-, penta-, or pararosanilin which vary in shade of violet depending on the extent of methylation (designated R for reddish shades, B for bluish shades); the ...
A nitrosourea antineoplastic agent resembling carmustine ( BCNU) and lomustine (CCNU). SYN: semustine.
Methyl-CpG-binding protein-2 (MECP2)
An enzyme which, when mutated, results in RTT (Rett syndrome), a genetic disease that is a uniform and striking, progressive neurologic developmental disorder and one of the ...
1. To mix with methanol. 2. To introduce a methyl group. 3. A compound in which a metal ion methyl replaces the alcoholic hydrogen of alcohol.
Addition of methyl groups; in histochemistry, used to esterify carboxyl groups and remove sulfate groups by treating tissue sections with hot methanol in the presence of ...
A quaternary derivative of atropine that is less lipid soluble and hence produces fewer central nervous system actions; a cycloplegic. SYN: atropine methylbromide.
A quaternary ammonium compound having a surface action like that of other cationic detergents; generally germicidal and bacteriostatic; used to rinse infant diapers and bed ...
A methyl ester of cellulose that forms a colorless viscous liquid when dissolved in water, alcohol, or ether; used to increase bulk of the intestinal contents, to relieve ...
A minor metabolite that accumulates in individuals with propionic acidemia.
A vesicant; irritating to the respiratory tract and will produce lung injury and eye injury; has been used in certain military operations.
An antihypertensive agent, also used as the ethyl ester hydrochloride, with the same action and uses. SYN: alpha methyl dopa.
A basic dye easily oxidized to azure, with dye mixtures; used in histology and microbiology, to stain intestinal protozoa in wet mount preparations, to track RNA and RNase in ...
Mobile liquid with a pungent odor; harmful vapor. Organic solvent used for cellulose acetate plastic; degreasing and cleaning fluids; and in food processing. Pharmaceutical aid ...
Staining readily with methylene blue; denoting certain cells and histologic structures. SYN: methylenophilic, methylenophilous. [ methylene + G. philos, fond]
A partially synthesized derivative of lysergic acid with oxytocic action, used to prevent or treat postpartum uterine atony and hemorrhage. SYN: methylergometrine maleate. ...
Cation commonly used in water-soluble iodinated radiographic contrast media. SYN: N-m..
- m. diatrizoate SYN: meglumine diatrizoate.
Pyruvaldehyde; the aldehyde of pyruvic acid; an intermediate of carbohydrate metabolism in certain organisms. SYN: pyruvic aldehyde.
- m. bis(guanylhydrazone) an antineoplastic ...
A volatile sympathetic amine base, used as an inhalant nasal decongestant.
2-Methylpropanedioic acid, an important intermediate in fatty acid metabolism; seen in elevated levels in cases of vitamin B12 deficiency. Note that methylmalonate is not methyl ...
Excretion of excessive amounts of methylmalonic acid in urine owing to deficient activity of methylmalonyl-CoA mutase or deficient cobalamin reductase. Two types occur: 1) an ...
An inherited metabolic (biochemical) disease that causes young children to become mentally retarded. The defect in some (but not all) of these children has to do with an inability ...
An intermediate in the degradation of several metabolites ( e.g., valine, methionine, odd-chain fatty acid s, theronine); elevated in cases of pernicious anemia.
Hydroxymethyl; the moiety, —CH2OH.
A sugar in which the carbon atom farthest from the carbonyl group is a methyl (CH3).
An antifungal preservative. SYN: methyl hydroxybenzoate.
A hexose (a 6-deoxyhexose) in which carbon-6 is part of a methyl group; e.g., rhamnose, fucose.
A central nervous system stimulant used to produce mild cortical stimulation in various types of depressions; commonly used in the treatment of hyperkinetic or hyperactive ...
An anti-inflammatory glucocorticoid.
- m. acetate has the same actions and uses as m.; aqueous suspensions are suitable for intrasynovial and soft tissue injection.
- sodium m. ...
A methyl derivative of testosterone, with the same actions and uses, except that it is active when given orally or sublingually. Used in the treatment of hypogenitalism. SYN: ...
Adenosine carrying an –SCH3 group in place of OH at position 5′; the –SCH3 group is transferred to α-aminobutyric acid to form l-methionine in some bacteria. M. is formed ...
An antithyroid compound with the same action as propylthiouracil, but with a smaller dose required.
A methylated tocol; e.g., tocotrienol, the tocopherols.
Any enzyme transferring methyl groups from one compound to another. SYN: demethylase, methylkinase, transmethylase.
A chemical group of drugs derived from xanthine (a purine derivative); members of the group include theophylline, caffeine, and theobromine.
A serotonin antagonist, weakly adrenolytic, chemically related to methylergonovine; used in the prophylactic treatment of vascular headache (migraine); untoward effects are ...
The root of Piper m. (family Piperaceae), a plant of the Pacific islands, used by the natives as an intoxicant. It has been used in diarrhea and in inflammatory affection of ...
Abbreviation for metmyoglobin.
Myoglobin in which the ferrous ion of the heme prosthetic group is oxidized to ferric ion; ferrimyoglobin.
A nondepolarizing neuromuscular blocking agent used to provide relaxation during surgical operations. SYN: dimethyl d-tubocurarine, dimethyl tubocurarine iodide.
A diuretic with antihypertensive activity.
Conjoined twins united at the forehead. See conjoined twins, under twin. [G. metopon, forehead, + pagos, something fixed]
Relating to the forehead or anterior portion of the cranium. [G. metopon, forehead]
A craniometric point midway between the frontal eminences. SYN: metopic point. [G. metopon, forehead]
Persistence of the frontal suture in the adult. [G. metopon, forehead]
Plastic surgery of the skin or bone of the forehead. [G. metopon, forehead, + plastos, formed]
The study of physiognomy. [G. metopon, forehead, + skopeo, to view]
A β-adrenergic blocking agent used in the treatment of hypertension; exhibits some cardioselectivity.
A genus of opisthorchid fish-borne flukes parasitic in the gallbladder of fish-eating mammals and birds, common in north temperate regions. M. conjunctus is a species that ...
SYN: heterecious. [G. meta, beyond, + xenos, host]
1. SYN: heterecism. 2. Change of host by a parasite. [G. meta, beyond, + xenos, host]
SYN: uterus. [G. uterus]
SYN: postpartum atony. [metra- + G. a- priv. + tonos, tension]
Pelvic cellulitis or other inflammatory affection in the puerperal period. [G. metra, uterus]
Quantitative; relating to measurement. See m. system. [G. metrikos, fr. metron, measure]
Having a head well proportioned to height; denoting a skull with an index between 72 and 77. SEE ALSO: orthocephalic. [G. metrios, moderate, fr. metron, measure, + kephale, head]
Inflammation of the uterus. [G. metra, uterus, + -itis, inflammation]
See metr-. [G. metra, uterus]
SYN: mother cell. [G. meter, mother, + kytos, a hollow (cell)]
Instrument for measuring the force of uterine contractions. [ metro- + G. dynamis, power, + metron, measure]
SYN: hysteralgia. [ metro- + G. odyne, pain]
An orally effective trichomonicide used in the treatment of infections caused by Trichomonas vaginalis and Entamoeba histolytica and Gram-negative anaerobic bacteria. Can ...
A tachistoscopic apparatus that exposes for timed intervals short selections of printed matter for reading; used in testing and developing reading speed. [G. metron, measure, + ...
SYN: metropathy. [L.]
- m. hemorrhagica abnormal, excessive, often continuous uterine bleeding due to persistence and exaggeration of the follicular phase of the menstrual ...
Any disease of the uterus, especially of the myometrium. SYN: metropathia. [ metro- + G. pathos, suffering]
Inflammation of the uterine veins usually following childbirth. [ metro- + G. phleps, vein, + -itis, inflammation]
Any irregular, acyclic bleeding from the uterus between periods. [ metro- + G. rhegnymi, to burst forth]
Discharge of mucus or pus from the uterus. [ metro- + G. rhoia, a flow]
Inflammation of the uterus and of one or both fallopian tubes. [ metro- + G. salpinx, trumpet (oviduct), + -itis, inflammation]