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, ...
The action of an intermediary substance (mediator).
An intermediary substance or thing.
- pharmacologic mediators of anaphylaxis substances released from mast (and other) cells by the reaction of antigen and specific ...
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 ...
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, ...
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 persons right to accept or reject a course of medical treatment even after that person becomes mentally or physically incapacitated to the ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 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 ...
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 ...
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 ...
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 ...
A medicine, medicinal application, or remedy. [L. medicamentum, medicine]
The United States governments 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 governments 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 governments health insurance program for the aged and some disabled ...
1. To treat disease by the giving of drugs. 2. To impregnate with a medicinal substance. [L. medico, pp. -atus, to heal]
Impregnated with a medicinal substance.
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.
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 ...
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 ...
Platelet-blocking drugs. Drugs that, like aspirin, reduce the tendency of platelets in the blood to clump and clot.
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 ...
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 ...
A drug used to treat fungal infections. Examples of antifungal drugs include miconazole (MONISTAT) and clotrimazole (LOTRIMIN, MYCELEX).
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 ...
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); ...
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 ...
Drugs that antagonize the action of adrenaline (a beta adrenergic substance) and relieve stress to the heart muscle.
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 ...
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 ...
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 ...
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 ...
Median cephalic, denoting the communicating vessel between the median and the cephalic veins of the forearm.
1. Relating to medicine having curative properties. SYN: medical (2). 2. SYN: medical (1).
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 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 ...
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 ...
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 ...
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 ...
The field of medicine encompassing diseases due to factors in the occupation of people. Occupational medicine was founded by the Italian physician Bernardino Ramazzini ...
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 ...
Medical. Cf.:iatro-. [L. medicus, physician]
Relating to both medicine and surgery, or to both physicians and surgeons. [ medico- G. cheirourgia, surgery]
Relating to both medicine and the law. SEE ALSO: forensic medicine. [ medico- + L. legalis, legal]
Relating to both medicinal and mechanical measures in therapeutics.
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 ...
Psychology in its relation to medicine. See medical psychology, health psychology.
An insurance policy in the United States that supplements Medicare benefits and presumably fills the gaps in healthcare coverage.
A supernumerary tooth located between the two maxillary central incisors. [medio- + L. dens, tooth]
Relating to the median plane and the dorsal plane.
Necrosis of a tunica media.
- m. of the aorta SYN: cystic medial necrosis.
- m. aortae idiopathica cystica SYN: cystic medial necrosis.
A thrusting of the mandibular condyle toward the midline during movement of the mandible. [medio- + L. trudo, pp. trusus, to thrust]
To incise in the median line. [L. medius, middle, + seco, pp. sectus, to cut]
: 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, ...
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 ...
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). ...
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 ...
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® 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 ...
An antineoplastic agent. SYN: medfalan.
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 ...
A glucocorticoid used topically as an anti-inflammatory agent, usually on the eye.
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 ...
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.
The inner portion of adrenal gland. (The outer portion is the adrenal cortex). The adrenal medulla makes epinephrine (adrenaline) and norepinephrine (noradrenaline). ...
Relating to the medulla or marrow. SYN: medullar.
1. Having a medulla or medullary substance. 2. SYN: myelinated.
1. Acquiring, or the act of formation of, marrow or medulla. 2. SYN: myelination.
Excision of any medullary substance. [medulla + G. ektome, excision]
Enlargement of the medullary spaces in the treatment of various skeletal disorders.
Medulla. Cf.:myel-. [L. medulla]
Inflammation of the cancellous articular extremity of a long bone.
: 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 ...
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 ...
A rare histologic variant of medulloblastoma with scattered smooth and striated muscle cells incorporated into the neoplasm.
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.
K., 19th century German physiologist. See M. formula, M.- Dubois formula.
R.A., 20th century Dutch physician. See M. lines, under line, M. stripes, under stripe.
A., German ophthalmologist, 1888–1969. See M. dystrophy.
An aspirinlike analgesic with antiinflammatory properties.
An antimalarial resembling quinine and chloroquine.
Abbreviation for magnetoencephalogram.
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 ...
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 ...
A bacterium of unusually large size. SYN: macrobacterium.
1. Congenital, nonobstructive enlargement of renal calices. 2. Excessively large number of calices. [ mega- + G. kalyx, cup of a flower, + -osis, condition]
Relating to or characterized by megacephaly. SYN: macrocephalic, macrocephalous, megacephalous.
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, ...
Antibacterial proteins produced by strains of Bacillus megaterium.
A coccus of unusually large size. SYN: macrococcus.
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 ...
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, ...
Excessive length and dilation of the colon. [ mega- + G. dolichos, long, + kolon, colon]
SYN: macrodont. [ mega- + G. odous (odont-), tooth]
Great enlargement of the lower portion of the esophagus, as seen in patients with achalasia and Chagas disease.
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 ...
Denoting an egg rich in yolk, as in bony fishes, reptiles, and birds. [ mega- + G. lekithos, yolk]
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 ...
Very severe pain. [ mega- + G. algos, pain]
Large; opposite of micro-. SEE ALSO: macro-, mega-. [G. megas (megal-)]
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 ...
SYN: cardiomegaly. [megalo- + G. kardia, heart]
SYN: megacystis. [megalo- + G. kystis, bladder]
A large (10–20 μm) nonnucleated red blood cell. [megalo- + G. kytos, cell]
An abnormally large brain. SYN: macroencephalon. [megalo- + G. enkephalos, brain]
Abnormal largeness of the brain. [megalo- + G. enkephalon, brain]
Abnormal largeness of the intestine. SYN: enteromegaly, enteromegalia. [megalo- + G. enteron, intestine]
Abnormally large size of the stomach. SYN: macrogastria. [megalo- + G. gaster, stomach]
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 ...
Congenital large globe. SYN: macrophthalmia, megophthalmus. [megalo- + G. ophthalmos, eye]
- anterior m. SYN: keratoglobus.
Having abnormally large viscera. SYN: macrosplanchnic. [megalo- + G. splanchnon, viscus]
SYN: thrombopoietin. [ mega- + G. poietes, maker, + -in]
SYN: macroprosopia. [ mega- + G. prosopon, face]
Denoting an orbital aperture with an index above 89. [ mega- + G. sema, sign]
A large blood platelet, especially a young one recently released from the bone marrow. [ mega- + G. thrombos, clot, + kytos, cell]
- primary m. independent ureteral dilation; may be nonobstructive or related to congenital distal ureteral obstruction.
- secondary m. hydroureter secondary ...
In radiation therapy, a term for voltage above one million volts.
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 ...
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 ...
USAN-approved contraction for N-methylglucamine.
- m. acetrizoate a radiographic contrast medium. See acetrizoate sodium.
- m. diatrizoate a water-soluble organic iodine ...
An eosinophilic leukocyte containing coarse granules. SYN: megoxycyte. [ mega- + G. oxys, acid, + phileo, to like]
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 ...
Hendrik (Heinrich), German anatomist, 1638–1700. See meibomian cyst, meibomian glands, under gland, meibomian sty.
Attributed to or described by Meibom.
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 ...
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 ...
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 ...
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 ...
Georg, German serologist, *1875. See Porges-M. test.
Henri, French physician, 1866–1940. See M. disease.
Joe V., U.S. gynecologist, 1892–1963. See M. syndrome.
Ernst, German physician, 1878–1945. See M. test.
For words beginning thus and not found here, see mio-.
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 ...
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 ...
See Wachstein-M. stain for calcium-magnesium- ATPase.
Georg, German histologist, 1829–1905. See M. corpuscle, M. plexus.
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.
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]
Rheumatic or myalgic pains in the arms or legs. [G. melos, limb, + agra, seizure]
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]
Prefix meaning dark or black. It comes from the Greek " melas", black. Examples of terms containing melan- include melancholia, melanin, melanocytes, melanoma and melena.
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 ...
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 ...
The presence of dark brown, almost black, or black granules of insoluble pigment ( melanin) in the circulating blood. [melan- + G. haima, blood]
Containing melanin or other black pigment. [melan- ( melanin) + L. ferro, to carry]
: 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 ...
Unusually marked, diffuse, melanin pigmentation of body hair and skin (usually not affecting the iris). SEE ALSO: melanosis.
A seborrheic keratosis with melanin pigmentation associated with proliferation of intraepidermal melanocytes. [ melano- + G. akantha, thorn, + suffix -oma, tumor]
SYN: melanotic neuroectodermal tumor of infancy. [ melano- + ameloblastoma]
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. [ ...
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 ...
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 ...
SYN: melanocyte. [ melano- + G. dendron, tree, + kytos, a hollow (cell)]
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 ...
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 ...
The presence of melanin precursors in the blood; may occur in malignant melanoma with metastasis. [ melanogen + G. haima, blood]
Formation of melanin. [ melanin + G. genesis, production]
A dark pigment, resembling melanin, formed from glucosamines in chitin. SYN: artificial melanin, factitious melanin.
Migration of conjunctival melanoblasts into the cornea. [ melano- + kerato- + G. -osis, condition]
Marbled, or marmorated, skin. [ melano- + G. leukos, white, + derma, skin]
- m. colli SYN: syphilitic leukoderma.
A hexapeptide similar to oxytocin; it stimulates the release of melanotropin. SYN: melanotropin-releasing factor, melanotropin-releasing hormone. [ melanotropin + L. libero, to ...
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 ...
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 ...
A raised, distinct, bluish- black tumor that may be encircled by particularly pale skin. Nodular melanoma is seen most often in middle-aged or
A condition characterized by numerous, widespread lesions of melanoma. [ melanoma + G. -osis, condition]
Black pigmentation of the nails. [ melano- + G. onyx (onych-), nail]
Any disease marked by abnormal pigmentation of the skin. [ melano- + G. pathos, suffering]
A histiocyte that has phagocytized melanin. [ melano- + G. phagein, to eat]
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 ...
The occurrence of pigmented patches on the tongue and buccal mucous membrane. [ melano- + G. plax, plate, plaque]
SYN: melena. [ melano- + G. rhegnymi, to burst forth]
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 ...
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 ...
Inhibits synthesis and release of melanotropin; neuropeptide Y. SYN: melanotropin release-inhibiting hormone. [ melanotropin + G. states, stationary, + -in]
1. Pertaining to the presence, normal or pathologic, of melanin. 2. Relating to or characterized by melanosis.