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melanotrichous
Having black hair. [ melano- + G. thrix (trich-), hair]
melanotroph
A cell of the intermediate lobe of the hypophysis that produces melanotropin. [ melano- + G. trophe, nourishment]
melanotrophin
SYN: melanotropin. [ melano- + G. trophe, nourishment, + -in]
melanotropin
A polypeptide hormone secreted by the intermediate lobe of the hypophysis in humans (in neurohypophysis in certain other species) which causes dispersion of melanin by ...
melanuria
The excretion of urine of a dark color, resulting from the presence of melanin or other pigments or from the action of phenol, creosote, resorcin, and other coal tar ...
melanuric
Pertaining to or characterized by melanuria.
melarsoprol
Used in the treatment of the meningoencephalitic stages of trypanosomiasis; may produce a fatal reactive encephalopathy.
MELAS
Acronym for mitochondrial myopathy, encephalopathy, lactic acidosis, and strokelike episodes. One of the mitochondrial disorders, this condition is usually hereditary, with a ...
MELAS syndrome
MELAS is the acronym for Mitochondrial Encephalopathy, Lactic Acidosis, and Stroke-like episodes. MELAS is a rare form of dementia. It is caused by mutations in the genetic ...
melasma
A patchy pigmentation of sun-exposed skin, seen most commonly in pregnancy. SEE ALSO: chloasma. [G. a black color, a black spot] - m. gravidarum chloasma occurring in ...
Melatonin
A hormone produced by the pineal gland, melatonin is intimately involved in regulating the sleeping and waking cycles, among other processes. Melatonin supplements are sometimes ...
Melchior
J.C., Danish physician. See Dyggve-M.- Clausen syndrome.
Melena
Stools or vomit stained black by blood pigment or dark blood products. * * * Passage of dark-colored, tarry stools, due to the presence of blood altered by the intestinal juices. ...
melenemesis
Vomiting of dark-colored or blackish material. SEE ALSO: black vomit. [G. melas, black, + emesis, vomiting]
Meleney
Frank L., U.S. surgeon, 1889–1963. See M. gangrene, M. ulcer.
melengestrol acetate
A progestational agent.
meletin
SYN: quercetin.
meli-
Honey, sugar. SEE ALSO: mel- (3). [G. meli]
melibiase
SYN: α-d-galactosidase.
melibiose
A disaccharide formed by the hydrolysis of raffinose by β-fructofuranosidase; also present in plant juices.
melicera, meliceris
A hygroma or other type of cyst that contains a relatively thick, tenacious, semifluid material. [G. meli- keris, a tumor, fr. melikeron, honeycomb, fr. meli, honey, + keros, ...
Melioidosis
An infectious illness, also called Whitmore's disease, that is most frequent in Southeast Asia and Northern Australia and is caused by a bacteria called " Pseudomonas ...
melissa
The leaves from the tops of M. officinalis (family Labiatae), a plant of southern Europe; a diaphoretic. SYN: sweet balm. [G. a bee]
melissic acid
A long-chain saturated fatty acid found in waxes. [G. melissa, bee + -ic]
Melissophobia
Fear of bees. A phobia is an unreasonable sort of fear that can cause avoidance and panic. Phobias are a relatively common type of anxiety disorder. Phobias can be treated with ...
melitis
Inflammation of the cheek. [G. melon, cheek, + -itis, inflammation]
melitose
SYN: raffinose.
melitracen hydrochloride
An antidepressant.
melitriose
SYN: raffinose.
melittin
The principal component in bee venom; m. is a peptide amide containing 26 amino acid s and is a hemolysin. [G. melitta, bee, + -in]
Melkersson
Ernst G., Swedish physician, 1898–1932. See M.- Rosenthal syndrome.
mellitum
A pharmaceutical preparation with honey as an excipient. [L. neut. of mellitus, honeyed]
Melnick
John C., U.S. radiologist, *1928. See M.-Needles osteodysplasty, M.- Needles syndrome.
melo-
See mel-.
melodidymus
A fetus with a supernumerary limb. [ melo- + G. didymos, twin]
melomania
An abnormal fascination with or devotion to music. [L. melos, song + mania, frenzy]
melomelia
A malformation in which the fetus has one or more rudimentary limbs in addition to the normal limbs. Cf.:micromelia. [G. melos, limb]
meloplasty
Old term for plastic surgery of the cheek; also for "facelift". [ melo- + G. plastos, formed]
melorheostosis
Rheostosis confined to the long bones. [G. melos, limb, + rheos, stream, + osteon, bone, + -osis]
meloschisis
Congenital cleft in the face. [G. melon, cheek, + schisis, a cleaving]
melotia
Congenital displacement of the auricle onto the cheek. [G. melon, cheek, + ous, ear]
melphalan
l-Phenylalanine mustard; l-sarcolysine; l-3-[p-[bis(2-chloroethyl)amino]phenyl]alanine; a phenylalanine derivative of nitrogen mustard; an alkalylating antineoplastic agent.
melt
Denature, used to describe RNA polymerase action in decoupling DNA base pairs.
Meltdown, genetic
A genomic crisis due to an extraordinarily high rate of mutation, a phenomenon known to occur in viruses and perhaps in other organisms. For example, the antiviral agent ...
Meltzer
Samuel J., U.S. physiologist, 1851–1920. See M. law, M.- Lyon test.
MEM
Abbreviation for Eagle minimum essential medium.
member
SYN: limb (1). [L. membrum] - inferior m. [TA] SYN: lower limb. - superior m. [TA] SYN: upper limb. - virile m. obsolete term for penis.
membra
Plural of membrum. [L.]
membrana
SYN: membrane (1). [L.] - m. abdominis SYN: peritoneum. - m. adamantina SYN: enamel cuticle. - m. adventitia 1. SYN: adventitia. 2. SYN: decidua capsularis. - m. atlanto- ...
membranaceous
SYN: membranous.
membranate
Of the nature of a membrane.
membrane
1. A thin sheet or layer of pliable tissue, serving as a covering or envelope of a part, as the lining of a cavity, as a partition or septum, or to connect two structures. SYN: ...
Membrane attack complex
An abnormal activation of the complement (protein) portion of the blood, forming a cascade reaction that brings blood proteins together, binds them to the cell wall, and then ...
Membrane, vaginal
A thin membrane which completely or partially occludes the vaginal opening. This fold of mucous membrane is usually present at birth at the orifice of the vagina. It is also ...
membranectomy
Removal of the membranes of a subdural hematoma. [membrane + G. ektome, excision]
membranelle
A minute membrane formed of fused cilia, found in certain ciliate protozoa.
membraniform
Of the appearance or character of a membrane. SYN: membranoid.
membranocartilaginous
1. Partly membranous and partly cartilaginous. 2. Derived from both a mesenchymal membrane and cartilage; denoting certain bones.
membranoid
SYN: membraniform.
membranous
Relating to or of the form of a membrane. SYN: hymenoid (1), membranaceous.
Membranous gingivitis, acute
This is trench mouth, a progressive painful infection with ulceration, swelling and sloughing off of dead tissue from the mouth and throat due to the spread of infection from the ...
membrum
A limb; a member. [L. member] - m. inferius [TA] SYN: lower limb. - m. muliebre obsolete term for clitoris. - m. superius [TA] SYN: upper limb. - m. virile SYN: penis.
Memory
The ability to recover information about past events or knowledge, and/or the process of doing so. Memory is often divided into short-term (also known as working or recent ...
Memory B cells
Secondary immune-system components that have an affinity for a particular antigen. Like other B cells, memory B cells originate from lymphocytes that develop and are activated in ...
Memory span
The number of items, usually words or numbers, that a person can retain and recall. Memory span is a test of working memory (short-term memory). In a typical test of memory ...
Memory, anterograde
Loss of short-term memory with retention of memories from the distant past (long-term memory).
Memory, long-term
A system for permanently storing, managing, and retrieving information for later use. Items of information stored as long-term memory may be available for a lifetime. Long-term ...
Memory, recent
Short-term memory. Also called working memory. Recent memory is a system for temporarily storing and managing the information required to carry out complex cognitive tasks such ...
Memory, short-term
A system for temporarily storing and managing information required to carry out complex cognitive tasks such as learning, reasoning, and comprehension. Short-term memory is ...
Memory, working
Short-term (recent) memory. Working memory is a system for temporarily storing and managing the information required to carry out complex cognitive tasks such as learning, ...
MEN
Abbreviation for multiple endocrine neoplasia.
MEN1
Abbreviation for multiple endocrine neoplasia, type 1.
MEN2A
Abbreviation for multiple endocrine neoplasia, type 2A.
menacme
The period of menstrual activity in a woman's life. [G. men, month, + akme, prime]
menadiol diacetate
Menadiol acetylated at both hydroxyl groups; a prothrombogenic vitamin. SYN: acetomenaphthone, vitamin K4.
menadiol sodium diphosphate
A dihydro derivative of menadione, with similar vitamin K activity.
menadione
The root of compounds that are 3-multiprenyl derivatives of m. and known as the menaquinones or vitamins K2. SYN: menaphthone, vitamin K3. - m. reductase SYN: NADPH ...
menaphthone
SYN: menadione.
menaquinone
The class name for a series of 2-methyl-3-all-trans-polyprenyl)-1,4-naphthoquinones (vitamins K2).
menaquinone-6
Hexaprenylmenaquinone; prenylmenaquinone-6; isolated from putrified fish meal; potency is about 60% of that of phylloquinone (vitamin K1). SYN: farnoquinone, vitamin K2, ...
menaquinone-7
Menaquinone-6 with a 3-heptaprenyl side chain. SYN: vitamin K2(35).
Menarche
The time in a girl's life that menstruation first begins. During the menarche period, menstruation may be irregular and unpredictable. Mood, weight, activity level, and growth ...
menarcheal, menarchial
Pertaining to the menarche.
Mendel
Gregor J., Austrian geneticist, 1822–1884. See mendelian character, mendelian inheritance, mendelian ratio, M. first law, M. second law. Kurt, German neurologist, ...
Mendel, Gregor
The great Moravian/Bohemian biologist (1822-84) who set forth the basic laws that constitute the foundation of classical genetics. Mendelian inheritance is the manner in which ...
Mendeléeff, Mendeleev
Dimitri (Dmitri) I., Russian chemist, 1834–1907. See mendelevium, M. law.
mendelevium
An element, atomic no. 101, atomic wt. 258.1, prepared in 1955 by bombardment of einsteinium with alpha particles. [D. Mendeléeff]
Mendelian
Referring to the great Moravian/Bohemian biologist Gregor Mendel (1822-84) who set forth the basic laws that constitute the foundation of classical genetics. Mendelian ...
Mendelian inheritance
The manner in which genes and traits are passed from parents to their children. The four modes of Mendelian inheritance are autosomal dominant, autosomal recessive, X-linked ...
Mendelian Inheritance in Man
A standard, comprehensive, regularly updated reference source for traits in humans that have been shown to be mendelian or that are thought on reasonable grounds to be so. Each ...
Mendelism
The principles of genetics, specifically of single-gene traits, based on the work of Gregor Mendel (1822-84), a Moravian monk and biologist who established the laws that are the ...
mendelizing
Denoting a pattern of inheritance of a trait that corresponds phenotypically to the segregation of known or putative genes at one genetic locus.
Mendelson
Curtis L., U.S. physician, *1913.
Ménétrier
Pierre E., French physician, 1859–1935. See M. disease, M. syndrome.
Menge
Karl, German gynecologist, 1864–1945. See M. pessary.
Ménière
Prosper, French physician, 1799–1862. See M. disease, M. syndrome.
Meniere disease
A condition with recurrent vertigo accompanied by ringing in the ears (tinnitus) and deafness. Symptoms include vertigo, dizziness, nausea, vomiting, loss of hearing (in the ...
mening-
See meningo-.
meningeal
Relating to the meninges.
meningeocortical
SYN: meningocortical.
meningeorrhaphy
Suture of the cranial or spinal meninges or of any membrane. [G. meninx (mening-), membrane, + rhaphe, suture]
Meninges
: The three membranes that cover the brain and spinal cord (singular: meninx). The outside meninx is called the dura mater, and is the most resilient of the three. The center ...
meningioangiomatosis
Proliferation of vessels and meningothelial cells, associated with epilepsy and neurofibromatosis.
Meningioma
: A type of brain tumor that starts within the meninges. These slow-growing tumors are sometimes associated with prior head trauma. * * * A benign, encapsulated neoplasm of ...
meningiomatosis
The presence of multiple meningiomas, sometimes seen in von Recklinghausen disease.
meningism
A condition in which the symptoms simulate a meningitis, but in which no actual inflammation of these membranes is present. SYN: pseudomeningitis.
meningitic
Relating to or characterized by meningitis.
Meningitis
Inflammation of the meninges, usually due to a bacterial infection but sometimes from viral, protozoan, or other causes (in some cases the cause cannot be determined). The onset ...
Meningitis vaccine
This term usually refers to a vaccine used to prevent meningococcal meningitis, an inflammation of the membranes that cover the brain and spinal cord due to bacterial infection ...
Meningitis, aseptic
Inflammation of the meninges that is not caused by bacterial infection. Viral meningitis is the most common cause of aseptic meningitis, but other causes include systemic lupus ...
Meningitis, bacterial
Inflammation of the meninges due to a bacterial infection, often with the streptococcus B bacteria. Treatment is by very strong antibiotics, and almost always takes place in a ...
Meningitis, benign recurrent aseptic
Recurring meningitis without identifiable cause that leaves no residual damage to the nervous system. Benign recurrent aseptic meningitis is also called Mollaret meningitis. ...
Meningitis, cryptococcal
Inflammation of the meninges due to infection with the fungal organism cryptococcus neoformans, which is found mainly in dirt and bird droppings. Most people have been exposed ...
Meningitis, infectious
Meningitis caused by bacterial, viral, or protozoan infection. Most of the agents known to cause meningitis are infectious, but very few people exposed to them will get ...
Meningitis, Kernig sign of
This clinical hallmark of meningitis, inflammation of the meninges, the membranes covering the brain and spinal cord, is tested for by having the person lie supine (flat on the ...
Meningitis, meningococcal
Inflammation of the meninges (the membranes covering of the brain and spinal cord) due to infection with the meningococcus bacterium Neisseria meningitidis. Meningococcal ...
Meningitis, Mollaret
Benign recurrent aseptic meningitis. The cause of Mollaret meningitis is not known. Mollaret meningitis is distinguished from viral meningitis by its recurrent character with ...
Meningitis, neoplastic
Inflammation of the meninges that occurs due to the spread of solid tumors to the brain or spinal cord. Treatment is with cancer-fighting drugs, such as methotrexate , and ...
Meningitis, viral
Inflammation of the meninges caused by a virus—usually one of the enteroviruses, such as mumps or coxsackievirus. These viruses are shed in the feces, sputum (spit), and ...
meningo-, mening-
The meninges. [G. meninx, membrane]
meningo-osteophlebitis
Inflammation of the veins of the periosteum.
meningocele
Protrusion of the membranes of the brain or spinal cord through a defect in the skull or spinal column. [meningo- + G. kele, tumor] - spurious m. an extracranial or extraspinal ...
Meningocele (MM)
Protrusion of the membranes that cover the spine and part of the spinal cord through a bone defect in the vertebral column. MM is due to failure of closure during embryonic life ...
Meningococcal meningitis
Inflammation of the meninges (the membranes covering of the brain and spinal cord) due to infection with the meningococcus bacterium Neisseria meningitidis. Meningococcal ...
Meningococcal vaccine
A vaccine to prevent meningococcal meningitis, an inflammation of the membranes that cover the brain and spinal cord due to bacterial infection by an organism called Neisseria ...
meningococcemia
Presence of meningococci (N. meningitidis) in the circulating blood. - acute fulminating m. rapidly moving systemic infection with Neisseria meningitidis, usually without ...
Meningococcus
A type of bacteria now formally known as Neisseria meningitidis, which is responsible for a number of meningococcal diseases including epidemic bacterial meningitis, an ...
meningocortical
Relating to the meninges and the cortex of the brain. SYN: meningeocortical.
meningocyte
A mesenchymal epithelial cell of the subarachnoid space; it may become a macrophage. [meningo- + G. kytos, cell]
meningoencephalitis
An inflammation of the brain and its membranes. SYN: cerebromeningitis, encephalomeningitis. [meningo- + G. enkephalos, brain, + -itis, inflammation] - acute primary hemorrhagic ...
meningoencephalocele
A protrusion of the meninges and brain through a congenital defect in the cranium, usually in the frontal or occipital region. SYN: encephalomeningocele. [meningo- + G. ...
meningoencephalomyelitis
Inflammation of the brain and spinal cord together with their membranes. [meningo + G. enkephalos, brain, + myelos, marrow, + -itis, inflammation]
meningoencephalopathy
Disorder affecting the meninges and the brain. SYN: encephalomeningopathy. [meningo- + G. enkephalos, brain, + pathos, suffering]
meningomyelitis
Inflammation of the spinal cord and of its enveloping arachnoid and pia mater, and less commonly also of the dura mater. [meningo- + G. myelos, marrow, + -itis, inflammation]
Meningomyelocele
Protrusion of the membranes that cover the spine but some of the spinal cord itself through a defect in the bony encasement of the vertebral column. The bony defect is spina ...
meningoradicular
Relating to the meninges covering cranial or spinal nerve roots. [meningo- + L. radix, root]
meningoradiculitis
Inflammation of the meninges and roots of the nerves.
meningorrhachidian
Relating to the spinal cord and its membranes. [meningo- + G. rhachis, spine]
meningorrhagia
Hemorrhage into or beneath the cerebral or spinal meninges. [meningo- + G. rhegnymi, to burst forth]
meningosis
Membranous union of bones, as in the skull of the newborn. [meningo- + G. -osis, condition]
meningovascular
Concerning the blood vessel s in the meninges; or the meninges and blood vessel s.
meninguria
The passage of membraniform shreds in the urine. [meningo- + G. ouron, urine]
meninx
Any membrane; specifically, one of the membranous coverings of the brain and spinal cord. SEE ALSO: arachnoid mater, dura mater, pia mater, leptomeninx. [Mod. L. fr. G. m., ...
meniscectomy
Excision of a meniscus, usually from the knee joint. [G. meniskos, crescent ( meniscus) + ektome, excision]
menisci
Plural of meniscus.
meniscitis
Inflammation of a fibrocartilaginous meniscus. [G. meniskos, crescent (meniscus), + -itis, inflammation]
meniscocyte
SYN: sickle cell. [G. meniskos, a crescent, + kytos, a hollow (cell)]
meniscopexy
Surgical procedure anchoring the medial meniscus to its former attachment. SYN: meniscorrhaphy. [menisco- + G. pexis, fixation]
meniscorrhaphy
SYN: meniscopexy. [menisco- + G. rhaphe, suture]
meniscotome
An instrument used in the removal of a meniscus. [G. meniskos, crescent ( meniscus) + tome, incision]
Meniscus
The word "meniscus" comes from the Greek and refers to a crescent-shaped structure. Today a meniscus is something that is shaped like a crescent moon or a croissant pastry. A ...
Meniscus injury
Injuries to the crescent-shaped cartilage pads between the two joints formed by the femur (the thigh bone) and the tibia (the shin bone). The meniscus acts as a smooth surface ...
Meniscus, lateral knee
The word " meniscus" refers to a crescent-shaped structure. The lateral meniscus of the knee is a thickened crescent-shaped cartilage pad between the two joints formed by the ...
Meniscus, medial knee
The word " meniscus" refers to a crescent-shaped structure. The medial meniscus of the knee is a thickened crescent-shaped cartilage pad between the two joints formed by the ...
Menkes
John H., U.S. neurologist, *1928. See M. syndrome.
Menkes syndrome
A genetic disorder, also known as kinky hair syndrome, in which the hair is fragile and twisted ("kinky") and there is progressive deterioration of the brain and arterial ...
meno-
The menses, menstruation. [G. men, month]
menocelis
A dark macular or petechial eruption sometimes occurring in cases of amenorrhea. [ meno- + G. kelis, spot]
Menometorrhagia
Excessive uterine bleeding, both at the usual time of menstrual periods and at other irregular intervals. This can be a sign of hormone imbalance, endometriosis, benign fibroid ...
menometrorrhagia
Irregular or excessive bleeding during menstruation and between menstrual periods. [ meno- + G. metra, uterus, + rhegnymi, to burst forth]
menopausal
Associated with or occasioned by the menopause.
menopause
Permanent cessation of the menses; termination of the menstrual life. [ meno- + G. pausis, cessation] - premature m. failure of cyclic ovarian function before age 40. SYN: ...
menophania
First sign of the menses at puberty. [ meno- + G. phaino, to show]
Menopon
A genus of biting lice (family Menoponidae, order Mallophaga) found on birds; it includes important pests that infect domestic fowl, such as M. gallinae (M. pallidum), the shaft ...
Menorrhagia
Excessive bleeding from the uterus which occurs right on schedule at the regular times of the menstrual periods but the bleeding is heavier than usual and may last longer than ...
menorrhalgia
SYN: dysmenorrhea. [ meno- + G. algos, pain]
menotropins
Extract of postmenopausal urine containing primarily the follicle-stimulating hormone. SEE ALSO: human menopausal gonadotropin, urofollitropin.
menouria
Menstruation occurring through the urinary bladder as a result of vesicouterine fistula. [ meno- + G. ouron, urine, + -ia, condition]
menoxenia
Any abnormality of menstruation. [ meno- + G. xenos, strange]
menses
A periodic physiologic hemorrhage, occurring at approximately 4-week intervals, and having its source from the uterine mucous membrane; usually the bleeding is preceded by ...
menstrual
Relating to the menses. [L. menstrualis]
Menstrual cramps
Cramping in the lower abdomen, usually in the first or second day of the menstrual cycle. These are caused contractions of the uterus as it expels its unneeded contents, and also ...
Menstrual cycle
The monthly cycle of changes in the ovaries and the lining of the uterus (endometrium), starting with the preparation of an egg for fertilization. When the follicle of the ...
Menstrual irregularity
The normal menstrual cycle is about four weeks long, and often follows the phases of the moon. Its length varies from three to seven days, but is usually consistent. However, ...
Menstrual spotting
The presence of apparent menstrual blood during the wrong parts of the menstrual cycle. Some women have a tendency to bleed around ovulation, which occurs at about the 14th day ...
Menstrual synchronization
A phenomenon that occurs when two or more menstruating women live together, in which the menstrual cycles of the women gradually become synchronized. The mechanism and reason for ...
menstruant
Menstruating.
menstruate
To undergo menstruation. [L. menstruo, pp. -atus, to be menstruant]
Menstruation
The periodic blood that flows as a discharge from the uterus. Also called menorrhea, the time during which menstruation occurs is referred to as menses. The menses occurs at ...
Menstruation, anovular
1. Menstruation that occurs without ovulation. The egg stays in the ovary. 2. Menstruation that occurs without ovulation. Usually the egg that remains in the ovary simply ...
Menstruation, cessation of
Menstruation ends naturally in middle age with the onset of the menopause. It can also end suddenly as a result of induced menopause. Cessation of menstruation in ...
Menstruation, retrograde
The flow of menstrual blood from the uterus into the fallopian tubes, and potentially into the abdomen. This condition can lead to endometriosis.
menstruum
Old term for solvent. [Mediev. L. menstrual fluid, thought to possess certain solvent properties, ntr. of L. menstruus, monthly]
mensual
Monthly. [L. mensis, month]
mensuration
The act or process of measuring. [L. mensuratio, fr. mensuro, to measure]
mental
1. Relating to the mind. [L. mens (ment-), mind] 2. Relating to the chin. SYN: genial, genian. [L. mentum, chin]
Mental child injury
Also known as emotional child abuse, this is the third most frequently reported form of child abuse (after child neglect and physical child abuse), accounting 17% of all ...
Mental retardation
A term used when a person has certain limitations in mental functioning and in skills such as communicating, taking care of him or herself, and social skills. These limitations ...
Mental retardation and clasped thumbs
A syndrome with the following characteristic features: (1) Neurological: Mental retardation and aphasia (lack of speech); (2) Limbs: Clasped (adducted) thumbs, absent extensor ...
Mental retardation with optic atrophy, deafness & seizures
A disorder first reported in 1999 by Gustavson and colleagues as a newly recognized X-linked mental retardation syndrome. In the family they studied there were 7 male children in ...
mentalis
See m. (muscle). [L.]
mentality
The functional attributes of the mind; mental activity.
mentation
The process of reasoning and thinking.
Menten
Maud L., Canadian pathologist in U.S., 1879–1960. See Michaelis-M. constant, Michaelis-M. hypothesis.
Mentha
A genus of plants of the family Labiatae. M. piperita is peppermint; M. pulegium, pennyroyal; M. viridis, spearmint. SYN: mint. [L.]
menthane
The monocyclic terpene parent of alcohols such as menthol and terpin.
menthol
An alcohol obtained from peppermint oil or other mint oils, or prepared synthetically; used as an antipruritic and topical anesthetic, in nasal sprays, cough drops, and ...
menthyl salicylate
Used as a sunscreen to filter out ultraviolet light in preparations to protect the skin from sunburn.
mentolabialis
The mentalis and depressor labii inferioris considered as one muscle. [L.]
menton
In cephalometrics, the lowermost point in the symphysial shadow as seen on a lateral jaw projection. [L. mentum, chin]
mentoplasty
Plastic surgery of the chin, whereby its shape or size is altered. [L. mentum, chin, + G. plastos, formed]
mentum
SYN: chin. [L.]
menyanthes
SYN: buckbean.
mepacrine hydrochloride
SYN: quinacrine hydrochloride.
mepazine acetate
A phenothiazine derivative with actions and uses similar to those of chlorpromazine. Also available as m. hydrochloride.
mepenzolate bromide
An anticholinergic drug.
meperidine hydrochloride
A widely used narcotic analgesic. SYN: pethidine.
mephenesin
A centrally acting skeletal muscle relaxant; also available as m. carbamate.
mephentermine
A sympathomimetic amine. - m. sulfate used topically as a nasal decongestant and systemically for its pressor effects in acute hypotensive states.
mephenytoin
An anticonvulsant used when safer agents prove inadequate; used in drug metabolism studies.
mephitic
Foul, poisonous, or noxious. [L. mephitis, a noxious exhalation]
mephobarbital
Used as a sedative and long-acting hypnotic, and as an anticonvulsant in the management of epilepsy; converted to phenobarbital in the body.
mepivacaine hydrochloride
A local anesthetic agent.
meprobamate
A skeletal muscle relaxant with action similar to that produced by mephenesin but of longer duration; used in the management of certain disorders associated with abnormal motor ...
meptazinol
A narcotic analgesic mixed agonist/antagonist (like pentazocine) which is about one-tenth as potent as morphine in producing analgesia. Though its abuse potential is less than ...
mepyramine maleate
SYN: pyrilamine maleate.
mepyrapone
SYN: metyrapone.
mEq, meq
Abbreviation for milliequivalent.
meralgia
Pain in the thigh; specifically, m. paresthetica. [G. meros, thigh, + algos, pain] - m. paresthetica burning pain, tingling, pruritus, or formication along the lateral aspect ...
meralluride
A mercurial diuretic.
merbromin
The disodium salt of 2,7-dibromo-4-hydroxymercurifluorescein; an organic mercurial antiseptic compound that also has staining properties similar to those of eosin and phloxine, ...
mercaptal
A substance derived from an aldehyde by the replacement of the bivalent oxygen by two thioalkyl (–SR) groups.
mercaptan
1. A class of substances in which the oxygen of an alcohol has been replaced by sulfur ( e.g., cysteine). SYN: thioalcohol. See thiol. 2. In dentistry, a class of elastic ...
mercapto-
Prefix indicating the presence of a thiol group, –SH.
mercaptoacetic acid
SYN: thioglycolic acid.
mercaptoethanol
A commonly used reducing agent.
mercaptol
A substance derived from a ketone by the replacement of the bivalent oxygen by two thioalkyl (–SR) groups.
mercaptolactate-cysteine disulfiduria
Elevated levels of the mixed disulfide of 3-mercaptolactate and cysteine in the urine.
mercaptomerin sodium
A mercurial diuretic.
mercapturic acid
A condensation product of l-cysteine with aromatic compounds, such as bromobenzene, and usually acetylated; formed biologically via glutathione in the liver and excreted in the ...
Mercier
Louis A., French urologist, 1811–1882. See M. bar, M. sound, M. valve, median bar of M..
mercocresols
A mixture consisting of equal parts by weight of sec-amyltricresol and o-hydroxy-phen-ylmercuric chloride; it possesses fungicidal, germicidal, and bacteriostatic action.
mercumatilin
A mercurial diuretic; also available as m. sodium.
mercuramide
SYN: mersalyl.
mercurial
1. Relating to mercury. 2. Any salt of mercury used medicinally. 3. Having the characteristic of rapid, changing moods.
mercurialentis
A brown discoloration of the anterior capsule of the lens caused by mercury; early sign of mercurial poisoning.
mercurialism
SYN: mercury poisoning.
mercuric
Denoting a salt of mercury in which the ion of the metal is bivalent, as in corrosive sublimate, m. chloride, HgCl2; the mercurous chloride is calomel, HgCl.
mercuric chloride
A topical antiseptic and disinfectant for inanimate objects. SYN: corrosive sublimate, mercury bichloride, mercury perchloride, corrosive mercury chloride. - ammoniated ...
mercuric iodide, red
Has been used as an antiseptic and as a disinfectant for inanimate objects. SYN: mercury biniodide, mercury deutoiodide.
mercuric oleate
An ointment-like preparation used in parasitic skin diseases.
mercuric oxide, red
The red precipitate of HgO; it has been used externally as an antiseptic in chronic skin diseases and fungus infections. SYN: red precipitate.
mercuric oxide, yellow
The yellow precipitate of HgO; used externally as an antiseptic in the treatment of inflammatory conditions of the eyelids and the conjunctivae. SYN: yellow precipitate.
mercuric salicylate
A powder used externally in the treatment of parasitic and fungus skin diseases. SYN: mercury subsalicylate.
mercurochrome
SYN: merbromin.
mercurophen
A local antiseptic.
mercurophylline sodium
The sodium salt of β-methoxy-γ-hydroxymercuripropylamide of trimethylcyclopentanedicarboxylic acid, and theophylline; a mercurial diuretic.
mercurous
Denoting a salt of mercury in which the ion of the metal is univalent, as in calomel, m. chloride, HgCl; the mercuric chloride is corrosive sublimate, HgCl2.
mercurous chloride
SYN: calomel.
mercurous iodide
Used externally as an ointment in eye diseases. SYN: mercury protoiodide, yellow mercury iodide.
mercury
A dense liquid metallic element, atomic no. 80, atomic wt. 200.59; used in thermometers, barometers, manometers, and other scientific instruments; some salts and organic ...
Mercury poisoning
The metallic element mercury is poisonous to humans. Mercury poisoning can occur in both acute and chronic forms. Acute mercury poisoning (which today is less common) is ...
mere-, mero-
Part; also indicating one of a series of similar parts. SEE ALSO: -mer. [G. meros, share]
Merendino
K. Alvin, U.S. surgeon, 1914–1985. See M. technique.
mereprine
SYN: doxylamine succinate.
Meretoja
J., Finnish physician. See M. syndrome.
meridian
1. [TA] A line encircling a globular body at right angles to its equator and touching both poles, or the half of such a circle extending from pole to pole. SYN: meridianus ...
meridiani
Plural of meridianus.
meridianus
SYN: meridian (1). [L.] - meridiani bulbi oculi [TA] SYN: meridians of eyeball, under meridian.
meridional
Relating to a meridian.
merispore
A secondary spore, one resulting from the segmentation of another (compound or septate) spore. [G. meros, a part, + sporos, seed]
meristematic
Pertaining (in fungi) to an area (meristem) of the hyphae or of other specialized structures from which new growth occurs. [G. merizein, to divide]
meristic
Symmetrical; that which can be divided evenly; denoting bilateral or longitudinal symmetry in the arrangement of parts in one organism. [G. meristikos, suitable for dividing]
Merkel
Karl L., German anatomist and laryngologist, 1812–1876. See M. filtrum ventriculi, M. fossa, M. muscle. Friedrich S., German anatomist and physiologist, 1845–1919. See M. ...
Merkel cell carcinoma
An infrequent but highly malignant type of skin cancer. Characteristically starts in a sun-exposed area (of the head, neck, arms or legs) in whites 60-80 years of age as a firm, ...

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