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mediate
1. (me′de-it)Situated between; intermediate. 2. (me′de-at)To effect something by means of an intermediary substance, as in complement-mediated phagocytosis. [L. mediatus, ...
mediation
The action of an intermediary substance (mediator).
mediator
An intermediary substance or thing. - pharmacologic mediators of anaphylaxis substances released from mast (and other) cells by the reaction of antigen and specific ...
medicable
Treatable, with hope of a cure.
Medicaid
State programs of public assistance to persons regardless of age whose income and resources are insufficient to pay for health care. The United States federal government provides ...
medical
1. Relating to medicine or the practice of medicine. SYN: medicinal (2). 2. SYN: medicinal (1). [L. medicalis, fr medicus, physician]
Medical College Admissions Test (MCAT)
The MCAT is a test that is required of all applicants to medical school in the U.S. and Canada. The MCAT is "a standardized test used to assess applicants' science knowledge, ...
medical corps
The subdivision of a military organization, such as the U.S. Army, devoted to medical care of the troops.
Medical directives, advance
Advance directives preserve the person’s right to accept or reject a course of medical treatment even after that person becomes mentally or physically incapacitated to the ...
Medical geography
An important "new" area of health research that is a hybrid between geography and medicine dealing with the geographic aspects of health and healthcare. Medical geography studies ...
Medical helminthology
The field of medicine that pertains to helminths (worms) capable of disease in people. For more about these worms, see "Helminth." The public health impact of medical helminths ...
Medical history
In medicine, the patient's past and present which may hopefully contain clues helpful to their health past, present, and future. The medical history, being an account of all ...
Medical journal, first American
The first U.S. medical journal, the Medical Repository, was founded in 1797 and published quarterly until 1824. It was “the first serious attempt in this country to present the ...
Medical journals
In 1665 the Royal Society in England published one of the first 2 scientific journals in the world: the "Philosophical Transactions of the Royal Society." The other was the ...
Medical physics
The science of human health and radiation exposure. Medical physics, also called health physics, is devoted to radiation safety. The international professional body for health ...
Medical Repository
The first medical magazine and the first scientific journal published in the United States. The Medical Repository was founded in 1797 in New York and was published quarterly ...
Medical Research Council (MRC)
In the United Kingdom (UK) and some Commonwealth countries, MRC stands for the Medical Research Council which serves more or less as the counterpart of the National Institutes ...
Medical research resource, American Type Culture Collection as
Although little known to the general public, the American Type Culture Collection (ATCC) is a key resource for medical research. It is the world's premier biological culture ...
Medical school, first American
King's College Medical School founded in New York in 1767. Its mission was fairly lofty — to "enlarge the Mind, improve the Understanding, polish the whole Man, and qualify them ...
Medical symbol
A staff or rod with a snake curled around it is the staff (the rod) of Aesculapius (also called Asklepios), the ancient mythical god of medicine. His Greek name was Asklepios ...
medical transcriptionist
An individual who performs machine transcription of physician-dictated medical reports concerning a patient's health care, which become part of the patient's permanent medical ...
Medicalize
To identify a condition as a disorder requiring medical treatment. The term "medicalize" is usually used in a pejorative or disparaging sense. For example, "The recommendation ...
medicament
A medicine, medicinal application, or remedy. [L. medicamentum, medicine]
medicamentosus
Relating to a drug; denoting a drug eruption. [L.]
Medicare
The United States government’s health insurance program for older people and some who are younger but are disabled. Medicare is funded by the Social Security Administration. ...
Medicare Part A
The Medicare program that covers inpatient hospital stays. Medicare is the United States government’s health insurance program for the aged and some disabled persons. ...
Medicare Part B
The Medicare program that covers physician and outpatient services. Medicare is the United States government’s health insurance program for the aged and some disabled ...
medicate
1. To treat disease by the giving of drugs. 2. To impregnate with a medicinal substance. [L. medico, pp. -atus, to heal]
medicated
Impregnated with a medicinal substance.
medication
1. The act of medicating. 2. A medicinal substance, or medicament. - ionic m. SYN: iontophoresis. - maintenance m. m. taken to stabilize an illness or symptoms of illness. - ...
Medication, ACE-inhibitor
A drug that inhibits ACE (angiotensin converting enzyme) which is important to the formation of angiotensin II. Angiotensin II causes arteries in the body to constrict and ...
Medication, anti-infective
Something capable of acting against infection, by inhibiting the spread of an infectious agent or by killing the infectious agent outright. Anti-infective is a general term that ...
Medication, anti-platelet
Platelet-blocking drugs. Drugs that, like aspirin, reduce the tendency of platelets in the blood to clump and clot.
Medication, antibiotic
A drug used to treat bacterial infections. The original definition of an antibiotic was a substance produced by one microorganism that selectively inhibits the growth of another ...
Medication, anticoagulant
A drug that is used as a "blood-thinner" to prevent the formation of blood clots and to maintain open blood vessels. Anticoagulants have various uses. Some are used for ...
Medication, antifungal
A drug used to treat fungal infections. Examples of antifungal drugs include miconazole (MONISTAT) and clotrimazole (LOTRIMIN, MYCELEX).
Medication, antimicrobial
A drug used to treat a microbial infection. Antimicrobial is a general term that refers to a group of drugs that includes antibiotics, antifungals, antiprotozoals, and ...
Medication, antiprotozoal
Something that destroys protozoa or inhibits their growth and ability to reproduce. A few of the protozoa of medical importance include Plasmodium (the cause of malaria); ...
Medication, antiviral
An drug that kills viruses or suppresses their replication and, hence, inhibits their capability to multiply and reproduce. For example, amantadine (BRAND name: SYMMETREL) is a ...
Medication, beta-blocker
Drugs that antagonize the action of adrenaline (a beta adrenergic substance) and relieve stress to the heart muscle.
Medication, clot-dissolving
Drugs used to dissolve blood clots. Agents such as plasminogen-activator (t-PA) and streptokinase that are effective in dissolving clots and re-opening arteries. Used, for ...
Medication, generic
The term "generic" has several meanings as regards medications (drugs): The chemical name of a drug. A term referring to the chemical makeup of a drug rather than to the ...
Medication, vasodilator
Drugs that act as blood vessel dilator (vasodilators) and open vessels by relaxing their muscular walls). For example, nitroglycerin is a vasodilator. So are the ACE ...
medicator
1. An instrument for use in making therapeutic applications to the deeper parts of the body. 2. One who gives medicaments for the relief of disease; sometimes applied in derision ...
medicephalic
Median cephalic, denoting the communicating vessel between the median and the cephalic veins of the forearm.
medicinal
1. Relating to medicine having curative properties. SYN: medical (2). 2. SYN: medical (1).
medicinal scarlet red
SYN: scarlet red.
medicine
1. A drug. 2. The art of preventing or curing disease; the science concerned with disease in all its relations. 3. The study and treatment of general diseases or those affecting ...
Medicine, adoption
Medicine for the adopted child, including pre-adoption counseling and evaluation based on a child's medical records as well as post-adoption consultations and, often, primary ...
Medicine, forensic
The branch of medicine that deals with the application of medical knowledge to legal problems and legal proceedings. Forensic medicine is also called legal medicine. A physician ...
Medicine, geriatric
The branch of medicine concerned with the diagnosis, treatment and prevention of disease in older people and the problems specific to aging. Also called geriatrics. From the ...
Medicine, legal
The branch of medicine that deals with the application of medical knowledge to legal problems and legal proceedings. Legal medicine is also called forensic medicine. A physician ...
Medicine, occupational
The field of medicine encompassing diseases due to factors in the occupation of people. Occupational medicine was founded by the Italian physician Bernardino Ramazzini ...
Medicine, transfusion
Blood transfusion and blood conservation are the complementary activities that constitute the clinical arena of transfusion medicine. Blood transfusion is the transfer of blood ...
Medicins Sans Frontieres
A group which sends physicians and other health workers to some of the most destitute and dangerous parts of the world and encourages them not only to care for people, but also to ...
medico-
Medical. Cf.:iatro-. [L. medicus, physician]
medicobiologic, medicobiological
Pertaining to the biologic aspects of medicine.
medicochirurgical
Relating to both medicine and surgery, or to both physicians and surgeons. [ medico- G. cheirourgia, surgery]
medicolegal
Relating to both medicine and the law. SEE ALSO: forensic medicine. [ medico- + L. legalis, legal]
medicomechanical
Relating to both medicinal and mechanical measures in therapeutics.
medicophysical
Relating to disease and the condition of the body in general; e.g., a m. examination, in which a person is examined in order to determine the presence or absence of disease as ...
medicopsychology
Psychology in its relation to medicine. See medical psychology, health psychology.
Medigap
An insurance policy in the United States that supplements Medicare benefits and presumably fills the gaps in healthcare coverage.
medio-, medi-
Middle, median. [L. medius]
mediocarpal
SYN: midcarpal.
medioccipital
SYN: midoccipital.
mediodens
A supernumerary tooth located between the two maxillary central incisors. [medio- + L. dens, tooth]
mediodorsal
Relating to the median plane and the dorsal plane.
mediolateral
Relating to the median plane and a side.
medionecrosis
Necrosis of a tunica media. - m. of the aorta SYN: cystic medial necrosis. - m. aortae idiopathica cystica SYN: cystic medial necrosis.
mediotarsal
SYN: midtarsal.
mediotrusion
A thrusting of the mandibular condyle toward the midline during movement of the mandible. [medio- + L. trudo, pp. trusus, to thrust]
mediotype
SYN: mesomorph.
medisect
To incise in the median line. [L. medius, middle, + seco, pp. sectus, to cut]
Meditation
: A self-directed practice for relaxing the body and calming the mind. Most meditative techniques have come to the West from Eastern religious practices, particularly India, ...
Mediterranean anemia
Better known today as thalassemia (or as beta thalassemia or thalassemia major) .The clinical picture of this important type of anemia was first described in 1925 by the ...
Mediterranean Fever
A inherited disorder of unknown cause featuring short recurring bouts of fever together with pain in the joints, chest or abdomen. Also called Familial Mediterranean Fever (FMF). ...
medium
1. A means; that through which an action is performed. 2. A substance through which impulses or impressions are transmitted. 3. SYN: culture m.. 4. The liquid holding a ...
medium-chain acyl-CoA dehydrogenase
See acyl-CoA dehydrogenase (NADPH).
medius
SYN: middle. [L.]
MEDLARS
MEDLARS® is an acronym that stands for Medical Literature Analysis and Retrieval System. It is a computer-based system of the U.S. National Library of Medicine (NLM) that ...
MEDLINE
MEDLINE® is the best known database of the U.S. National Library of Medicine (NLM). MEDLINE enables anyone to query the NLM computer's store of journal article references on ...
medphalan
An antineoplastic agent. SYN: medfalan.
medrogestone
An oral progestin.
medroxyprogesterone acetate
A progestational agent that is active orally as well as parenterally, and more potent than progesterone; used to control uterine bleeding and, in combination with ethynyl ...
medrylamine
An H1 antihistaminic.
medrysone
A glucocorticoid used topically as an anti-inflammatory agent, usually on the eye.
Medulla
The innermost part. The spinal medulla, for example, is that part of the spinal cord that is lodged within the vertebral canal. * * * Any soft marrow-like structure, especially in ...
Medulla oblongata
The base of the brain, which is formed by the enlarged top of the spinal cord. This part of the brain directly controls breathing, blood flow, and other essential functions.
Medulla, adrenal
The inner portion of adrenal gland. (The outer portion is the adrenal cortex). The adrenal medulla makes epinephrine (adrenaline) and norepinephrine (noradrenaline). ...
medullar
SYN: medullary.
medullary
Relating to the medulla or marrow. SYN: medullar.
Medullary cystic kidney disease, autosomal recessive type
A childhood genetic kidney disease in which there is progressive symmetrical destruction of the kidneys involving both the tubules and glomeruli, characteristically resulting in ...
medullated
1. Having a medulla or medullary substance. 2. SYN: myelinated.
medullation
1. Acquiring, or the act of formation of, marrow or medulla. 2. SYN: myelination.
medullectomy
Excision of any medullary substance. [medulla + G. ektome, excision]
medullization
Enlargement of the medullary spaces in the treatment of various skeletal disorders.
medullo-
Medulla. Cf.:myel-. [L. medulla]
medulloarthritis
Inflammation of the cancellous articular extremity of a long bone.
Medulloblastoma
: A type of virulent brain tumor that occurs most frequently in children. Medulloblastomas originate in residual embryonic nerve cells that begin to proliferate. Treatment is by ...
medullocell
SYN: myelocyte (2).
medulloepithelioma
A rare, primitive, rapidly growing intracranial neoplasm thought to originate from the cells of the embryonic medullary canal and hence included with ependymoblastomas by some ...
medullomyoblastoma
A rare histologic variant of medulloblastoma with scattered smooth and striated muscle cells incorporated into the neoplasm.
MEDVAC
Acronym for medical evacuation. MEDVAC typically refers to a team that is organized with the skills for the purpose of proper medical evacuation in situations of emergency.
Meeh
K., 19th century German physiologist. See M. formula, M.- Dubois formula.
Mees
R.A., 20th century Dutch physician. See M. lines, under line, M. stripes, under stripe.
Meesman
A., German ophthalmologist, 1888–1969. See M. dystrophy.
mefenamic acid
An aspirinlike analgesic with antiinflammatory properties.
mefenorex hydrochloride
A sympathomimetic drug with anorexic activity.
mefexamide
An antidepressant.
mefloquine
An antimalarial resembling quinine and chloroquine.
MEG
Abbreviation for magnetoencephalogram.
mega-
1. Combining form meaning large, oversize; opposite of micro-. SEE ALSO: macro-, megalo-. 2. (M) Prefix used in the SI and metric system to signify multiples of one million ...
Mega- (prefix)
The combining form " mega-" comes from the Greek "megas", great or big and means abnormally large. Megalocephaly is too large a head. Megacardia is too large a heart. Megacolon ...
megabacterium
A bacterium of unusually large size. SYN: macrobacterium.
megacalycosis
1. Congenital, nonobstructive enlargement of renal calices. 2. Excessively large number of calices. [ mega- + G. kalyx, cup of a flower, + -osis, condition]
megacardia
SYN: cardiomegaly.
megacaryoblast
SYN: megakaryoblast.
megacaryocyte
SYN: megakaryocyte.
megacephalia
SYN: megacephaly.
megacephalic
Relating to or characterized by megacephaly. SYN: macrocephalic, macrocephalous, megacephalous.
megacephalous
SYN: megacephalic.
megacephaly
A condition, either congenital or acquired, in which the head is abnormally large; usually applied to an adult skull with a capacity of over 1450 ml. SYN: leontiasis ossea, ...
megacins
Antibacterial proteins produced by strains of Bacillus megaterium.
megacoccus
A coccus of unusually large size. SYN: macrococcus.
megacolon
A condition of extreme dilation of the colon. SYN: giant colon. - acquired m. m. occurring on the basis of an acquired disease; occurs in inflammatory bowel disease (toxic m.) and ...
megacycle
One million cycles per second.
megacystis
Pathologically large bladder in children. SYN: megalocystis. [ mega- + kystis, bladder]
megadactyly, megadactylia, megadactylism
Condition characterized by enlargement of one or more digits (fingers or toes). SYN: dactylomegaly, macrodactylia, macrodactylism, macrodactyly, megalodactylia, megalodactylism, ...
megadolichocolon
Excessive length and dilation of the colon. [ mega- + G. dolichos, long, + kolon, colon]
megadont
SYN: macrodont. [ mega- + G. odous (odont-), tooth]
megadontism
SYN: macrodontia.
megadyne
One million dynes.
megaesophagus
Great enlargement of the lower portion of the esophagus, as seen in patients with achalasia and Chagas disease.
megagamete
SYN: macrogamete.
megagnathia
SYN: macrognathia.
megahertz
One million hertz.
megakaryoblast
The precursor of a megakaryocyte. SYN: megacaryoblast.
Megakaryocyte
A giant cell in the bone marrow that is the ancestor of blood platelets. * * * A large cell (as much as 100 μm in diameter) with a polyploid nucleus that is usually ...
megal-
See megalo-.
megalecithal
Denoting an egg rich in yolk, as in bony fishes, reptiles, and birds. [ mega- + G. lekithos, yolk]
Megalencephaly
Also called macrencephaly, a condition in which there is an abnormally large, heavy, and usually malfunctioning brain. By definition, the brain weight is greater than average for ...
megalgia
Very severe pain. [ mega- + G. algos, pain]
megalo-, megal-
Large; opposite of micro-. SEE ALSO: macro-, mega-. [G. megas (megal-)]
megaloblast
A large, nucleated, embryonic type of cell that is a precursor of erythrocytes in an abnormal erythropoietic process observed in pernicious anemia; a megaloblasts four stages of ...
megalocardia
SYN: cardiomegaly. [megalo- + G. kardia, heart]
megalocheiria, megalochiria
SYN: macrocheiria. [megalo- + G. cheir, hand]
megalocornea
SYN: keratoglobus.
megalocystis
SYN: megacystis. [megalo- + G. kystis, bladder]
megalocyte
A large (10–20 μm) nonnucleated red blood cell. [megalo- + G. kytos, cell]
megalocythemia
SYN: macrocythemia.
megalocytosis
SYN: macrocythemia.
megalodont
SYN: macrodont.
megalodontia
SYN: macrodontia.
megaloencephalic
Denoting an abnormally large brain.
megaloencephalon
An abnormally large brain. SYN: macroencephalon. [megalo- + G. enkephalos, brain]
megaloencephaly
Abnormal largeness of the brain. [megalo- + G. enkephalon, brain]
megaloenteron
Abnormal largeness of the intestine. SYN: enteromegaly, enteromegalia. [megalo- + G. enteron, intestine]
megalogastria
Abnormally large size of the stomach. SYN: macrogastria. [megalo- + G. gaster, stomach]
megaloglossia
SYN: macroglossia. [megalo- + G. glossa, tongue]
megalographia
SYN: macrography.
megalokaryocyte
SYN: megakaryocyte.
megalomania
1. A type of delusion in which the individual considers himself or herself possessed of greatness. He/she believes him/herself to be Christ, God, Napoleon, etc., or everyone and ...
megalomaniac
A person exhibiting megalomania.
megalomelia
SYN: macromelia.
megalophthalmos
Congenital large globe. SYN: macrophthalmia, megophthalmus. [megalo- + G. ophthalmos, eye] - anterior m. SYN: keratoglobus.
megalopodia
SYN: macropodia. [megalo- + G. pous, foot]
megalosplanchnic
Having abnormally large viscera. SYN: macrosplanchnic. [megalo- + G. splanchnon, viscus]
megalosplenia
SYN: splenomegaly.
megalospore
SYN: macrospore.
megalosyndactyly, megalosyndactylia
Condition of webbed or fused fingers or toes of large size. [megalo- + G. syn, together, + daktylos, finger]
megaloureter
SYN: ureterectasia. SYN: megaureter.
megalourethra
Congenital dilation of the urethra.
megamerozoite
SYN: macromerozoite.
meganucleus
SYN: macronucleus (1).
megapoietin
SYN: thrombopoietin. [ mega- + G. poietes, maker, + -in]
megaprosopia
SYN: macroprosopia. [ mega- + G. prosopon, face]
megaprosopous
SYN: macroprosopous.
megarectum
Extreme dilation of the rectum.
megaseme
Denoting an orbital aperture with an index above 89. [ mega- + G. sema, sign]
megasigmoid
SYN: macrosigmoid.
megasomia
SYN: macrosomia.
megaspore
SYN: macrospore.
megathrombocyte
A large blood platelet, especially a young one recently released from the bone marrow. [ mega- + G. thrombos, clot, + kytos, cell]
megaureter
SYN: megaloureter. - primary m. independent ureteral dilation; may be nonobstructive or related to congenital distal ureteral obstruction. - secondary m. hydroureter secondary ...
megavolt
One million volts.
megavoltage
In radiation therapy, a term for voltage above one million volts.
megestrol acetate
A synthetic progestin with progestational effects similar to those of progesterone; current uses include palliation in breast cancer and as an appetite stimulant in advanced ...
meglitinides
A class of oral glucose-lowering drugs that act by closing ATP-dependent potassium channels in pancreatic beta cells, thus causing calcium channel opening and subsequent insulin ...
meglumine
USAN-approved contraction for N-methylglucamine. - m. acetrizoate a radiographic contrast medium. See acetrizoate sodium. - m. diatrizoate a water-soluble organic iodine ...
megohm
One million ohms.
megophthalmus
SYN: megalophthalmos.
megoxycyte
SYN: megoxyphil.
megoxyphil, megoxyphile
An eosinophilic leukocyte containing coarse granules. SYN: megoxycyte. [ mega- + G. oxys, acid, + phileo, to like]
Megrim
Migraine. Usually periodic attacks of headaches on one or both sides of the head. Megrim (migraine) may be accompanied by nausea, vomiting, increased sensitivity of the eyes to ...
Meibom, Meibomius
Hendrik (Heinrich), German anatomist, 1638–1700. See meibomian cyst, meibomian glands, under gland, meibomian sty.
meibomian
Attributed to or described by Meibom.
Meibomian cyst
A cyst of the little glands in the tarsus (part of the framework) of the eyelids that make a lubricant which they discharge through their tiny openings in the edges of the ...
Meibomian glands
Little glands in the eyelids that make a lubricant which they discharge through their tiny openings in the edges of the lids. The lubricant is a fatty substance called sebum ...
Meibomianitis
Inflammation of the little glands in the tarsus (part of the framework) of the eyelids that make a lubricant which they discharge through their tiny openings in the edges of ...
Meibomitis
Inflammation of the little glands in the tarsus (part of the framework) of the eyelids that make a lubricant which they discharge through their tiny openings in the edges of ...
meibomitis, meibomianitis
Inflammation of the meibomian glands.
Meier
Georg, German serologist, *1875. See Porges-M. test.
Meige
Henri, French physician, 1866–1940. See M. disease.
Meigs
Joe V., U.S. gynecologist, 1892–1963. See M. syndrome.
Meinicke
Ernst, German physician, 1878–1945. See M. test.
meio-
For words beginning thus and not found here, see mio-.
Meiosis
What chromosomes do during germ cell formation to halve the chromosome number from 46 to 23. Chromosomes are the carriers of DNA, the hereditary material, in the cells of the ...
meiotic
Pertaining to meiosis.
Meiotic nondisjunction
Failure of two members of a chromosome pair to separate (disjoin) during meiosis so that both go to one daughter cell and none to the other. This mechanism is responsible for ...
Meissel
See Wachstein-M. stain for calcium-magnesium- ATPase.
Meissner
Georg, German histologist, 1829–1905. See M. corpuscle, M. plexus.
mel
1. SYN: honey. 2. Unit of pitch; a pitch of 1000 mels results from a simple tone of frequency 1000 Hz at 40 dB above the normal threshold of audibility.
mel-, melo-
1. Limb. [G. melos] 2. A cheek. [G. melon] 3. Honey, sugar. SEE ALSO: meli-. [L. mel, mellis, G. meli, melitos] 4. Sheep. [G. melon]
melagra
Rheumatic or myalgic pains in the arms or legs. [G. melos, limb, + agra, seizure]
melalgia
Pain in a limb; specifically, burning pain in the feet extending up the leg and even to the thigh. [G. melos, a limb, + algos, pain]
melamine formaldehyde
SYN: melamine resin.
Melan- (prefix)
Prefix meaning dark or black. It comes from the Greek " melas", black. Examples of terms containing melan- include melancholia, melanin, melanocytes, melanoma and melena.
melan-, melano-
Black, extreme darkness of hue. [G. melas]
melancholia
1. A severe form of depression marked by anhedonia, insomnia, psychomotor changes, and guilt. 2. A symptom occurring in other conditions, marked by depression of spirits and ...
melancholic
1. Relating to or characteristic of melancholia. 2. Formerly, denoting a temperament characterized by irritability and a pessimistic outlook. 3. A person who is exhibiting ...
melancholy
SYN: melancholia.
melanemia
The presence of dark brown, almost black, or black granules of insoluble pigment ( melanin) in the circulating blood. [melan- + G. haima, blood]
melaniferous
Containing melanin or other black pigment. [melan- ( melanin) + L. ferro, to carry]
Melanin
: A skin pigment (substance that gives the skin its color). Dark-skinned people have more melanin than light- skinned people. Melanin also acts as a sunscreen and protects the ...
melanism
Unusually marked, diffuse, melanin pigmentation of body hair and skin (usually not affecting the iris). SEE ALSO: melanosis.
melano-
See melan-.
melanoacanthoma
A seborrheic keratosis with melanin pigmentation associated with proliferation of intraepidermal melanocytes. [ melano- + G. akantha, thorn, + suffix -oma, tumor]
melanoameloblastoma
SYN: melanotic neuroectodermal tumor of infancy. [ melano- + ameloblastoma]
melanoblast
A cell derived from the neural crest; it migrates to various parts of the body early in embryonic life, and then becomes a mature melanocyte capable of forming melanin. [ ...
Melanocyte
A pigment-producing cell in the skin, hair and eye that determines their color. The pigment that melanocytes make is called melanin. The major determinant of color is not the ...
melanocytoma
1. A pigmented tumor of the uveal stroma. 2. Usually benign melanoma of the optic disk, appearing in markedly pigmented individuals as a small deeply pigmented tumor at the ...
melanodendrocyte
SYN: melanocyte. [ melano- + G. dendron, tree, + kytos, a hollow (cell)]
Melanoderma
Increased skin pigmentation, darkening of the skin. This is directly due to an increased amount of melanin pigment in the skin when there is increased production of melanin by ...
melanodermatitis
Excessive deposit of melanin in an area of dermatitis.
melanogen
A colorless substance that may be converted into melanin; e.g., some patients with widespread metastases of melanoma excrete m. in their urine, and melanin is formed when the ...
melanogenemia
The presence of melanin precursors in the blood; may occur in malignant melanoma with metastasis. [ melanogen + G. haima, blood]
melanogenesis
Formation of melanin. [ melanin + G. genesis, production]
melanoglossia
SYN: black tongue. [ melano- + G. glossa, tongue]
melanoid
A dark pigment, resembling melanin, formed from glucosamines in chitin. SYN: artificial melanin, factitious melanin.
melanokeratosis
Migration of conjunctival melanoblasts into the cornea. [ melano- + kerato- + G. -osis, condition]
melanoleukoderma
Marbled, or marmorated, skin. [ melano- + G. leukos, white, + derma, skin] - m. colli SYN: syphilitic leukoderma.
melanoliberin
A hexapeptide similar to oxytocin; it stimulates the release of melanotropin. SYN: melanotropin-releasing factor, melanotropin-releasing hormone. [ melanotropin + L. libero, to ...
melanoma
A malignant neoplasm, derived from cells that are capable of forming melanin, arising most commonly in the skin of any part of the body, or in the eye, and, rarely, in the mucous ...
Melanoma thickness
A method for determining the prognosis (outlook) with melanoma. The thickness of a melanoma is related to the 5-year survival rate after surgical removal of the tumor. Also ...
Melanoma, benign juvenile
A non-cancerous raised pink or red scaly area on a child’s skin, usually on the
Melanoma, choroidal malignant
A tumor of melanocytes in the choroid membrane that surrounds the
Melanoma, nodular
A raised, distinct, bluish- black tumor that may be encircled by particularly pale skin. Nodular melanoma is seen most often in middle-aged or
Melanoma, superficial spreading
The most common type of melanoma, a raised, irregular, colored area that
melanomatosis
A condition characterized by numerous, widespread lesions of melanoma. [ melanoma + G. -osis, condition]
melanonychia
Black pigmentation of the nails. [ melano- + G. onyx (onych-), nail]
melanopathy
Any disease marked by abnormal pigmentation of the skin. [ melano- + G. pathos, suffering]
melanophage
A histiocyte that has phagocytized melanin. [ melano- + G. phagein, to eat]
melanophore
A dermal pigment cell that does not secrete its pigment granules but participates in rapid color changes by intracellular aggregation and dispersal of melanosomes; it is well ...
melanoplakia
The occurrence of pigmented patches on the tongue and buccal mucous membrane. [ melano- + G. plax, plate, plaque]
melanoprotein
A protein complex containing melanin.
melanorrhagia
SYN: melena. [ melano- + G. rhegnymi, to burst forth]
melanorrhea
SYN: melena. [ melano- + G. rhoia, a flow]
melanosis
Abnormal dark brown or brown-black pigmentation of various tissues or organs, as the result of melanin or, in some situations, other substances that resemble melanin to varying ...
melanosome
The generally oval pigment granule (0.2 by 0.6 μm) produced by melanocytes. SYN: eumelanosome. [ melano- + G. soma, body] - giant m. a large spherical m. (1 to 6 μ in ...
melanostatin
Inhibits synthesis and release of melanotropin; neuropeptide Y. SYN: melanotropin release-inhibiting hormone. [ melanotropin + G. states, stationary, + -in]
melanotic
1. Pertaining to the presence, normal or pathologic, of melanin. 2. Relating to or characterized by melanosis.
melanotonin
See melatonin.

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