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pyrimethamine
A potent folic acid antagonist used as an antimalarial agent effective against Plasmodium falciparum; a valuable suppressant, active against the asexual erythrocytic and ...
Pyrimidine
One of the two classes of bases in DNA and RNA. The pyrimidine bases are thymine (T) and cytosine (C) in DNA and thymine (T) and uracil (U) in RNA. * * * 1,3-Diazine; a ...
pyrin
An abnormal neutrophil protein encoded by the MEFV gene in familial Mediterranean fever. SYN: marenostrin.
pyrithiamin
A thiamin antimetabolite, differing from thiamin in that the thiazole ring of the thiamin molecule is replaced by a pyridine ring. SYN: neopyrithiamin.
pyro-
1. Combining form denoting fire, heat, or fever. SEE ALSO: pyr-, pyreto-. 2. In chemistry, combining form denoting derivatives formed by removal of water (usually by heat) to ...
pyroboric acid
SYN: tetraboric acid.
pyrocalciferol
A thermal decomposition product of calciferol.
pyrocatechase
SYN: catechol 1,2-dioxygenase.
pyrocatechin
SYN: pyrocatechol.
pyrocatechol
1,2-Benzenediol; a constituent of the catecholamines, epinephrine and norepinephrine, and dopa; used externally as an antiseptic. SYN: catechol (1), pyrocatechin.
pyrogallic acid
SYN: pyrogallol.
pyrogallol
Used externally in the treatment of psoriasis, ringworm, and other skin affections. SYN: pyrogallic acid.
pyrogallolphthalein
SYN: gallein.
pyrogen
A fever-inducing agent; pyrogens are produced by bacteria, molds, viruses, and yeasts. [ pyro- + G. -gen, producing] - endogenous p. (EP) proteins that induce fever. Several ...
pyrogenic
Causing fever. SEE ALSO: febrifacient. SYN: pyretogenetic, pyretogenic, pyretogenous.
pyroglobulins
Serum proteins (immunoglobulins), usually associated with multiple myeloma or macroglobulinemia, which precipitate irreversibly when heated to 56°C.
pyroglutamic acid
SYN: 5-oxoproline.
pyroligneous
Relating to or produced by the dry distillation of wood. [ pyro- + L. lignum, wood]
pyrolysis
Decomposition of a substance by heat. [ pyro- + G. lysis, dissolution]
pyromania
A morbid impulse to set fires. SYN: incendiarism. [ pyro- + G. mania, frenzy]
pyromaniac
One affected with pyromania; arsonist.
pyromen
SYN: piromen.
pyrometer
An instrument for measuring very high degrees of heat, beyond the capacity of a mercury or gas thermometer. [ pyro- + G. metron, measure] - resistance p. SYN: resistance ...
pyrone
A keto derivative of pyran. SYN: pyranone.
pyronin
A fluorescent red basic xanthene dye, the chloride of tetramethyldiaminoxanthene, p. Y or p. G (C.I. 45005), or of tetraethyldiaminoxanthene, p. B (C.I. 45010). These dyes, ...
pyroninophilia
An affinity for the basic pyronin dyes; a useful indicator of intense protein synthesis accompanying RNA synthesis, as in the cytoplasm of an active plasma cell. [ pyronin + G. ...
pyrophobia
Morbid dread of fire. [ pyro- + G. phobos, fear]
pyrophosphatase
Any enzyme cleaving a pyrophosphate bond between two phosphoric groups, leaving one on each of the two fragments; e.g., inorganic p., NAD+ p. (cleaves NAD, etc., to ...
pyrophosphate
A salt of pyrophosphoric acid; accumulates in cases of hypophosphatasia; sometimes referred to as inorganic p. (PPi). SYN: diphosphate. - 99mTc p. a radionuclide tracer used ...
pyrophosphokinases
Enzymes (EC 2.7.6.x) transferring a pyrophosphoric group ( e.g., phospho-α-d-ribosyl-pyrophosphate synthetase). SYN: pyrophosphotransferases.
pyrophosphoric acid
An anhydride of phosphoric acid obtained by heating phosphoric acid to 213°C; it forms pyrophosphates with bases, and its esters are important in energy metabolism and in ...
pyrophosphorylases
Trivial name applied to the nucleotidyltransferases that catalyze the transfer of the AMP of ATP to another residue with the release of inorganic pyrophosphate, or the ...
pyrophosphotransferases
SYN: pyrophosphokinases.
pyropoikilocytosis
A rare recessive disorder manifested by severe hemolysis, marked poikilocytosis, and a characteristic sensitivity of the red cells to heat-induced fragmentation in vitro; ...
pyroscope
An instrument for measuring temperature by comparing the light of a heated object with a light standard. [ pyro- + G. skopeo, to view]
pyrosis
Substernal pain or burning sensation, usually associated with regurgitation of acid-peptic gastric juice into the esophagus. SYN: heartburn. [G. a burning]
pyrotherapy
Treatment of disease by inducing an artificial fever in the patient. SYN: therapeutic fever.
pyrotic
1. Relating to pyrosis. 2. SYN: caustic.
pyrotoxin
Obsolete term for a toxic substance produced in the tissues during the progress of a fever.
pyroxylin
Consists chiefly of cellulose tetranitrate, obtained by the action of nitric and sulfuric acid s on cotton; used in the preparation of collodion. SYN: colloxylin, ...
pyrrobutamine phosphate
An antihistamine.
pyrrol blue
An acid triarylmethane dye employed as a vital dye and as an elastin stain. SYN: Isamine blue.
pyrrolase
SYN: tryptophan 2,3-dioxygenase.
pyrrole
Divinylenimine; a heterocyclic compound found in many biologically important substances. SYN: azole, imidole.
pyrrolidine
1. Tetrahydropyrrole; pyrrole to which four H atoms have been added; the structural basis of proline and hydroxyproline. 2. A class of alkaloids containing a p. (1) moiety or ...
pyrrolidone-5-carboxylate
SYN: 5-oxoproline.
pyrroline
A group of isomers of pyrrole to which two H atoms have been added; 1-p. has a double bond between the nitrogen and an adjacent carbon.
pyrroline-2-carboxylate reductase
An oxidoreductase reducing 1-pyrroline-2-carboxylate to l-proline with NAD(P)H. SYN: proline dehydrogenase, proline oxidase.
pyrroline-5-carboxylate reductase
An oxidoreductase reversibly reducing 1-pyrroline-5-carboxylate to l-proline with NAD(P)H; a deficiency of this enzyme is associated with type I hyperprolinemia. SYN: proline ...
pyruvaldoxine
SYN: isonitrosoacetone.
pyruvate
A salt or ester of pyruvic acid. - active p. an intermediate formed in the oxidative decarboxylation of p.. Cf.:p. dehydrogenase (lipoamide). SYN: α-lactyl- thiamin ...
pyruvic acid
2-Oxopropanoic acid; α-ketopropionic acid; acetylformic acid; pyroacemic acid; the simplest α-keto acid; an intermediate compound in the metabolism of carbohydrate; in thiamin ...
pyruvic aldehyde
SYN: methylglyoxal.
pyruvic-malic carboxylase
SYN: malate dehydrogenase.
pyrvinium pamoate
A highly effective drug used in the eradication of human pinworms. SYN: viprynium embonate.
Pythium insidiosum
A species of fungi found in water or wet soil, and a cause of hyphomycosis or pythiosis.
pythogenesis
1. Origination from decaying matter. 2. The causation of decay. [G. pytho, to decay, + genesis, origin]
pythogenic, pythogenous
Originating from filth or putrescence.
Pyuria
Pus in the urine. Pyuria is a sign of inflammation often related to infection. * * * Presence of pus in the urine when voided. [G. pyon, pus, + ouron, urine]
Q
Symbol for coulomb; quantity; quaternary; glutamine; glutaminyl; pseudouridine; coenzyme Q; electric charge; the second product formed in an enzyme-catalyzed reaction. Symbol ...
q
1. In cytogenetics, symbol for long arm of a chromosome (in contrast to p for the short arm). 2. Abbreviation for [L.] quodque, each; every. 3. q. Symbol for heat.
q arm of a chromosome
The long arm of a chromosome. All human chromosomes have 2 arms — a short arm and a long arm — that are separated from each other only by the centromere, the point at which ...
Q band
A form of chromosome band, one of the bright and dull fluorescent bands seen alternating along the length of chromosomes under ultraviolet light after the chromosomes are ...
q in population genetics
The frequency of the less common of two different alternative (allelic) versions of a gene. (The frequency of the more common allele is p).
Q-banding
See Q- banding stain.
Q-TWiST
Time without symptoms or toxicity; a quality of life measurement. [acronym, quality time without symptoms or toxicity]
q.d.
Abbreviation for L. quaque die, every day.
q.d. (on prescription)
Seen on a prescription, q.d. (or qd) means one a day (from the Latin quaque die). The abbreviation is sometimes written without a period in capital letters as "QD". However it is ...
q.h.
Abbreviation for L. quaque hora, every hour.
q.h. (on prescription)
Abbreviation for "every hour." On a prescription or doctor's hospital orders, q.h. means every hour. Also written qh (without the periods). From the Latin quaque ...
q.i.d.
Abbreviation for L. quater in die, four times a day.
q.i.d. (on prescription)
Seen on a prescription, q.i.d. (or qid) means 4 times a day (from the Latin quater in die). The abbreviation q.i.d. is also sometimes written without a period in capital ...
q.l.
Abbreviation for L. quantum libet, as much as desired.
q.n.s.
On a lab report, q.n.s. (or qns or QNS) means Quantity Not Sufficient. Not enough blood, urine or whatever to do the test.
Q.R.
Abbreviation for [L] quantum rectum, however much is correct.
q.s.
Abbreviation for L. quantum sufficiat or satis, as much as suffices.
q.v.
Abbreviation for [L] quantum> vis, as much as you wish.
Q10
Symbol for the increase in rate of a process produced by raising the temperature 10°C; rate of contraction of an excised heart approximately doubles for every 10°C ( i.e., Q10 = ...
QALY
Quality adjusted life year, a year of life adjusted for its quality or its value. A year in perfect health is considered equal to 1.0 QALY. The value of a year in ill health would ...
qd (on prescription)
Seen on a prescription, qd (or, written with periods, q.d.) means one a day (from the Latin quaque die). The abbreviation is sometimes written without a period in capital letters ...
QF
Abbreviation for quality factor, the same as relative biologic effectiveness in radiation protection.
QH2
Symbol for ubiquinol.
qid (on prescription)
Seen on a prescription, qid (or q.i.d.) means 4 times a day (from the Latin quater in die). The abbreviation qid or q.i.d. is also sometimes written without a period in capital ...
QNB
Abbreviation for quinuclidinyl benzilate.
QO, QO2
Symbols for oxygen consumption (1). Symbol for the microliters STPD of CO2 given off per milligram of tissue per hour.
QRS complex
The deflections in an electrocardiographic (ECG or EKG) tracing that represent the ventricular activity of the heart.
QT syndrome, long
An inherited defect in the heart's rhythm. In the U.S. it is estimated that 4,000 American children and young adults die yearly of the long QT syndrome. It is a common cause of ...
QT syndrome, long (LQTS)
A genetic (inherited) condition that predisposes individuals to irregular heartbeats (arrhythmias), fainting spells and sudden death. The irregular heartbeats are typically ...
Quack
1) A practitioner who suggests the use of substances or devices for the prevention or treatment of disease that are known to be ineffective. 2) A person who pretends to be able ...
Quackery
Deliberate misrepresentation of the ability of a substance or device for the prevention or treatment of disease. We may think that the day of patent medicines is gone but look ...
quadrangular
Having four angles. [L. quadrangularis, fr. quadrangulum, quadrangle]
Quadrant
A quarter. For example, the liver is in the right upper quadrant of the abdomen. * * * One quarter of a circle. In anatomy, roughly circular areas are divided for descriptive ...
quadrantanopia
Loss of vision in a quarter section of the visual field of one or both eyes; if bilateral, it may be homonymous or heteronymous, binasal or bitemporal, or crossed, e.g., ...
quadrate
Having four equal sides; square. [L. quadratus, square]
quadratus
q. lumborum fascia anterior layer of thoracolumbar fascia.
quadri-
Four. [L. quattuor]
quadribasic
Denoting an acid having four hydrogen atoms that are replaceable by atoms or radicals of a basic character.
Quadriceps
Although the term "quadriceps" technically may refer to any four-headed muscle, it usually refers to and is synonymous with the quadriceps muscle of the thigh, the large muscle ...
Quadriceps stretch
An exercise to stretch the quadriceps muscle, the large muscle in the front of the thigh. To do this exercise, lie on your left side, on the floor. Your hips should be lined up ...
quadricepsplasty
A corrective surgical procedure on the quadriceps femoris muscle and tendon to release adhesions and improve mobility. [ quadriceps + G. plastos, formed]
quadricuspid
SYN: tetracuspid.
quadridigitate
SYN: tetradactyl. [ quadri- + L. digitus, digit]
quadrigeminal
Four-fold. [ quadri- + L. geminus, twin]
quadrigeminum
One of the quadrigeminal bodies.
quadrigeminus
SYN: quadruplet. [L.]
quadrigeminy
SYN: quadrigeminal rhythm.
Quadriparesis
Weakness of all four limbs, both arms and both legs, as for example from muscular dystrophy. * * * SYN: tetraparesis.
Quadriplegia
Paralysis of all four limbs, both arms and both legs, as from a high spinal cord accident or stroke. * * * Paralysis of all four limbs. SYN: tetraplegia. [ quadri- + G. plege, ...
quadriplegic
Pertaining to or afflicted with quadriplegia. SYN: tetraplegic.
quadripolar
Having four poles.
quadrisect
To divide into four parts. SYN: quartisect. [ quadri- + L. seco, pp. sectus, to cut]
quadrisection
Division into four parts.
quadritubercular
Having four tubercles or cusps, as a molar tooth. [ quadri- + L. tuberculum, tubercle]
quadrivalent
Having the combining power (valency) of four. SYN: tetravalent.
quadruped
A four-footed animal. [L. quattuor, four, + pes (ped-), foot]
quadruplet
One of four children born at one birth. SYN: quadrigeminus. [L. quadruplus, fourfold]
Qualitative
Having to do with quality. In contrast to quantitative (which pertains to quantity, the amount).
Quality adjusted life year (QALY)
A year of life adjusted for its quality or its value. A year in perfect health is considered equal to 1.0 QALY. The value of a year in ill health would be discounted. For ...
quality assurance
Programs of regular assessment of medical and nursing activities to evaluate the quality of medical care.
Quality of life
An important consideration in medical care, quality of life refers to the patient’s ability to enjoy normal life activities. Some medical treatments can seriously impair quality ...
Quant
C. A. J., early 20th century Dutch physician. See Q. sign.
quanta
Plural of quantum. [L.]
quantile
Division of a distribution into equal, ordered subgroups; deciles are tenths, quartiles are quarters, quintiles are fifths, terciles are thirds, centiles are hundredths. [L. ...
Quantitative
Having to do with quantity or with the amount. See also qualitative.
quantum
1. A unit of radiant energy (ε) varying according to the frequency (ν) of the radiation. 2. A certain definite amount. [L. how much] - q. mottle q. mottle. See entries ...
Quaque (on prescription)
If a medicine is to be taken every so- many hours, it is written "q_h"; the "q" standing for the Latin word for once "quaque" and the "h" indicating the number of hours. So, for ...
Quaque die (on prescription)
Seen on a prescription, qd (or, written with periods, q.d.) means one a day (from the Latin quaque die). The abbreviation is sometimes written without a period in capital letters ...
Quarantine
The period of isolation decreed to control the spread of infectious disease. Before the era of antibiotics, quarantine as one of the few available means for halting the spread of ...
quark
A fundamental particle believed to be the primary constituent of all mesons and baryons; quarks have a charge that is a fraction of 1 electron charge and interact through ...
quart
1. A measure of fluid capacity; the fourth part of a gallon; the equivalent of 0.9468 liter. An imperial q. contains about 20% more than the ordinary q., or 1.1359 liters. 2. A ...
quartan
Recurring every fourth day, including the first day of an episode in the computation, i.e., after a free interval of two days. [L. quartanus, relating to a fourth (thing)] - ...
quartisect
SYN: quadrisect. [L. quartus, fourth, + seco, pp. sectus, to cut]
quartz
A crystalline form of silicon dioxide used in chemical apparatus and in optical and electric instruments.
Quasi-
Prefix meaning seemingly. As, for example, in quasidominant, seemingly dominant.
Quasidiploid
Describing a cell that seems to have the usual two full sets of 23 chromosomes, but does not. Many malignant cells are quasidiploid. Also called pseudodiploid.
quasidominance
Simulation of dominant inheritance of a recessive trait, e.g., a heterozygote mating with an affected homozygote resulting in the manifestation of the recessive trait ...
Quasidominant
Pattern of inheritance that seems due to a dominant trait but is in fact due to the mating of a person who has a recessive disorder (with two copies of a gene causing the ...
quassation
The breaking up of crude drug materials, such as bark and woody stems, into small pieces to facilitate extraction and other treatment. [L. quassatio, fr. quasso, pp. -atus, to ...
quassia
Bitterwood, the heartwood of Picrasma excelsa (Picraena excelsa), known as Jamaica q., or of Q. amara (family Simarubaceae), known as Surinam q.; a bitter tonic; the infusion ...
quater in die
See q.i.d. [L. four times a day]
Quater in die (on prescription)
Seen on a prescription, qid (or q.i.d.) means 4 times a day (from the Latin quater in die). The abbreviation qid or q.i.d. is also sometimes written without a period in capital ...
quaternary
1. Denoting a chemical compound containing four elements; e.g., NaHSO4. Cf.:q. structure. 2. Fourth in a series. 3. Relating to organic compounds in which some central atom is ...
Quatrefages de Breau
Jean L.A. de, French naturalist, 1810–1892. See Quatrefages angle.
quazepam
A benzodiazepine derivative used as a sedative and hypnotic.
quebrachine
An alkaloid, C21H26N2O3, from quebracho and identical with yohimbine; formerly used in cardiac dyspnea.
quebracho
The dried bark of a genus of trees, Aspidosperma quebrachoblanco (family Apocynaceae); has been used as a respiratory stimulant in emphysema, dyspnea, and chronic bronchitis; ...
Queckenstedt
Hans, German neurophysiologist, 1876–1918. See Q.- Stookey test.
Queensland tick typhus
One of the tick-borne rickettsial diseases of the eastern hemisphere, similar to Rocky Mountain spotted fever, but less severe, with fever, a small ulcer (eschar) at the site of ...
quenching
1. The process of extinguishing, removing, or diminishing a physical property such as heat or light; e.g., the cooling of a hot metal rapidly by plunging it into water or oil. 2. ...
Quénu
Eduard A.V.A., French surgeon and anatomist, 1852–1933. See Q. hemorrhoidal plexus, Q.- Muret sign.
quercetin
An aglycon of quercitrin, rutin, and other glycosides; occurs usually as the 3-rhamnoside; used in the treatment of abnormal capillary fragility. SYN: meletin, sophoretin.
quercus
The bark of Q. alba, white oak or stone oak; formerly used as an astringent. [L. oak]
querulent
Denoting one who is ever suspicious, always opposing any suggestion, complaining of ill treatment and of being slighted or misunderstood, easily enraged, and dissatisfied; ...
Quervain
Fritz de. See de Q..
questionnaire
A list of questions submitted orally or in writing to obtain personal information or statistically useful data. - Holmes- Rahe q. a survey to measure in life change units the ...
Quetelet
Lambert Alphonse Jacques, 1796–1857. Belgian astronomer and mathematician.
Queyrat
Auguste, French dermatologist, *1872. See erythroplasia of Q..
Quick
Armand J., U.S. physician, 1894–1978. See Q. method, Q. test.
quick
1. Pregnant with a child whose fetal movements are recognizable. 2. A sensitive part, painful to touch. [A.S. cwic, living]
Quickening
The moment during pregnancy when the baby is first felt to move. * * * Signs of life felt by the mother as a result of fetal movements, usually noted from 16 to 20 weeks of ...
quicklime
Unslaked lime. See lime (2).
quicksilver
SYN: mercury.
Quiescence
Inactivity, quietness. In cells, quiescence is the state of not dividing. In neurons (nerve cells), quiescence is the state of not firing. The word comes from the Latin ...
Quiescent
1. Inactive, resting. For example, tuberculosis can be a quiescent (inactive) infection. 2. Marked by a state of inactivity, repose, or tranquillity. For example, a quiescent ...
quin-, quino-
Root of quinoline and quinone, hence used in many names of substances containing these structures ( e.g., quinine, quinol).
quin-2
(2-[(2-bis-[carboxymethyl]aono-5-methoxyphenyl)-methyl-6- methoxy-8-bis[carboxymethyl]aminoquinoline); a fluorescent compound that binds Ca++ tightly. The wavelengths of light ...
quina
SYN: cinchona. [Sp., fr. Peruv. q. or kina, cinchona]
quinacrine hydrochloride
An acridine derivative, used as an antimalarial that destroys the trophozoites of Plasmodium vivax and P. falciparum, but does not affect the gametocytes, sporozoites, or ...
quinaldic acid
Quinoline-2-carboxylic acid; a product of l-tryptophan catabolism, via kynurenic acid, found in human urine. SYN: quinaldinic acid.
quinaldine red
A styrene-quinolinium iodide; used as a pH indicator (turns red at pH 3.2) in a 1% ethanol solution.
quinaldinic acid
SYN: quinaldic acid.
quinaquina
SYN: cinchona. [a reduplication of Sp. quina, cinchona]
quinate
A salt or ester of quinic acid. - q. dehydrogenase an oxidoreductase catalyzing reaction of q. and NAD+ to form 3-dehydroquinate and NADH.
quinazolines
A class of alkaloids that are derived biosynthetically from anthranilic acid.
quince
The edible fruit of Cydonia oblongata (family Rosaceae); the seeds have demulcent properties.
Quincke
Heinrich I., German physician, 1842–1922. See Q. pulse, Q. puncture, Q. sign.
Quincke's disease
This is angioneurotic edema (or angioedema), a form of localized swelling of the deeper layers of the skin and fatty tissues beneath the skin. Hereditary angioneurotic edema ...
quinestrol
The 3-cyclopentyl ether of ethinyl estradiol; used as the estrogenic component in oral contraceptive preparations; the compound is stored in fat and can be taken weekly; an ...
quinethazone
A diuretic and antihypertensive agent.
quingestanol acetate
A progestational agent.
quinhydrone
A mixture of equimolecular quantities of quinone and hydroquinone; used in pH determinations ( i.e., via a q. electrode).
quinic acid
l-q.; the (−) isomer is an acid found in cinchona bark and elsewhere in plants; 5-dehydroquinic acid is an intermediate in the biosynthesis of l-phenylalanine, l-tyrosine, and ...
quinidine
β-Quinine; one of the alkaloids of cinchona, a stereoisomer of quinine (the C-9 epimer); used as an antimalarial; also used in the treatment of atrial fibrillation and ...
Quinine
The original antimalarial agent, quinine took its name from the Peruvian Indian word "kina" meaning " bark of the tree" referring to the cinchona tree. From this tree, quinine ...
quininism
SYN: cinchonism.
Quinlan test
See under test.
quino-
See quin-.
quinocide hydrochloride
An antimalarial comparable to primaquine in effectiveness and scope.
quinol
SYN: hydroquinone.
quinoline
1. Benzo pyridine; 1-benzazine; a volatile nitrogenous base obtained by the distillation of coal tar, bones, alkaloids, etc.; a basic structure of many dyes and drugs; also ...
quinolinic acid
A catabolite of l-tryptophan and a precursor of NAD+.
quinolinol
SYN: 8-hydroxyquinoline.
quinolizidines
A class of alkaloids based on the quinolizidine (norlupinane) structure.
quinology
The botany, chemistry, pharmacology, and therapeutics of cinchona and its alkaloids. [Sp. quina, cinchona, + G. logos, study]
quinolones
A class of synthetic broad-spectrum antibacterial agents that exhibit bactericidal action ( e.g., ciprofloxacin). SYN: fluoroquinolone.
quinone
1. General name for aromatic compounds bearing two oxygens in place of two hydrogens, usually in the para position; the oxidation product of a hydroquinone. 2. SYN: ...
quinovose
SYN: d-epirhamnose.
quinquedigitate
SYN: pentadactyl. [L. quinque, five, + digitus, digit]
quinquetubercular
Having five tubercles or cusps, as certain molar teeth. [L. quinque, five, + tuberculum, tubercle, dim. of tuber, a swelling]
quinquevalent
SYN: pentavalent. [L. quinque, five, + valentia, strength]
quinquina
SYN: cinchona.
Quinsy
Not a TV detective but an old word for a peritonsillar abscess. Whether you call it quinsy or a peritonsillar abscess, it is a collection of pus (an abscess) behind the tonsils ...
quintan
Recurring every fifth day, including the first day of an episode in the computation, i.e., after a free interval of three days. [L. quintus, fifth]
Quintan fever
Quintan means recurring every 5 days, the characteristic duration of trench fever. Quintan or trench fever is a disease borne by body lice that was first recognized in the ...
quintuplet
One of five children born at one birth. [L. quintuplex, fivefold]
quinuclidinyl benzilate
A highly potent anticholinergic agent exhibiting 50- to 100-fold greater potency over atropine in binding with and blocking muscarinic cholinergic receptors. Originally ...
quisqualate
An agonist at glutamate receptors of the amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid (AMPA) type. The anion formed when quisqualic acid is dissolved in water. See ...
quisqualic acid
Excitatory amino acid (EAA) obtained from the seeds of Quisqualis chinensis. Used to identify a specific subset of non–N-methyl D-aspartate ( NMDA) EAA receptor; has ...
quodque
Each, every. [L.]
quot. op. sit.
Abbreviation for quoties opus sit, as often as necessary.
Quotidian
Recurring each day, as in a fever that returns every day. From the Latin "quotidianus" meaning "daily." (In French, the noun "quotidien" is a daily newspaper). * * * Daily; ...
Quotient
The result of mathematical division. The I.Q. (Intelligence Quotient) is arrived at by dividing the person's mental age (as determined on the Binet test) by the person's ...
q_h (on prescription)
If a medicine is to be taken every so- many hours, it is written "q_h"; the "q" standing for the Latin word for once "quaque" and the "h" indicating the number of hours. So, for ...
R
Abbreviation or symbol for electrical resistance; radical (usually an alkyl or aryl group, e.g., ROH is an alcohol, RNH2 an amine); Réaumur; respiration; respiratory exchange ...
r
Abbreviation for roentgen; radius. 1. Symbol for correlation coefficient. 2. Abbreviation for racemic, occasionally used in naming compounds in place of the more common dl or ...
R (symbol)
This much-used symbol has many meanings in medicine. They include: {{}}Respiration: a nurse's note of "R20" is shorthand for 20 respirations (breaths) per minute. Right: A ...
R-banding
See R- banding stain.
R.C.P.
Abbreviation for Royal College of Physicians (of England). 1. Abbreviation for Royal College of Physicians (Edinburgh). 2. Symbol for reactivity. Abbreviation for Royal College ...
R.C.P.S.C.
Abbreviation for Royal Colleges of Physicians and Surgeons of Canada.
R.C.S.
Abbreviation for Royal College of Surgeons (England). Abbreviation for Royal College of Surgeons (Edinburgh). Abbreviation for Royal College of Surgeons (Ireland).
R.D.
Abbreviation for registered dietician.
R.D.H.
Abbreviation for Registered Dental Hygienist.
R.E.
Abbreviation for right eye.
R.N.
Abbreviation for registered nurse.
R.Ph.
Abbreviation for Registered Pharmacist.
R.Q.
Abbreviation for respiratory quotient.
Ra
Symbol for radium.
rabbeting
Obsolete term for making congruous stepwise cuts on apposing bone surfaces for stability after impaction. [Fr. raboter, to plane]
rabid
Relating to or suffering from rabies. [L. rabidus, raving, mad]
Rabies
A potentially fatal viral infection that attacks the central nervous system. The rabies virus is carried primarily by wild animals, especially bats and raccoons. It finds its way ...
rabiform
Resembling rabies.
rac-
Prefix for racemic.
racefemine
Used as a uterine relaxant for relief of postpartum pain.
racemase
An enzyme capable of catalyzing racemization, i.e., inversions of asymmetric groups; when more than one center of asymmetry is present, “epimerase” is used ( e.g., ...
racemate
A racemic compound, or the salt or ester of such a compound. SEE ALSO: racemic.
raceme
An optically inactive chemical compound. SEE ALSO: racemic.
racemic
Denoting a mixture of optically active compounds that is itself optically inactive, being composed of an equal number of dextro- and levorotatory substances, which are separable. ...
racemization
Partial conversion of one enantiomorph into another (as an l-amino acid to the corresponding d-amino acid) so that the specific optical rotation is decreased, or even reduced to ...
Racemose
A descriptive term for something that is in a cluster or bunch.From the Latin “racemus” meaning “a cluster or bunch, particularly of grapes.” * * * Branching, with ...
Racemose aneurysm
An aneurysm that looks like a bunch of grapes.
racephedrine hydrochloride
A sympathomimetic drug with peripheral effects similar to those of epinephrine and with the same actions and uses as ephedrine.
rachi-, rachio-
The spine. [G. rhachis, spine, backbone]
rachial
SYN: spinal.
rachicentesis
SYN: lumbar puncture. [rachi- + G. kentesis, puncture]
rachidial
SYN: spinal.
rachidian
SYN: spinal.
rachilysis
Forcible correction of lateral curvature of the spine by lateral pressure against the convexity of the curve. [rachi- + G. lysis, a loosening]
rachio-
See rachi-.
rachiocentesis
SYN: lumbar puncture. [ rachio- + G. kentesis, puncture]
rachiochysis
A subarachnoid effusion of fluid in the spinal canal. [ rachio- + G. chysis, a pouring out]
rachiopagus
Conjoined twins united back to back with union of their spinal columns. See conjoined twins, under twin. SYN: rachipagus. [ rachio- + G. pagos, something fixed]
rachioplegia
SYN: spinal paralysis. [ rachio- + G. plege, stroke]
rachiotome
A specially devised instrument for dividing the laminae of the vertebrae. SYN: rachitome. [ rachio- + G. tome, incision]
rachiotomy
SYN: laminotomy. [ rachio- + G. tome, incision]
rachipagus
SYN: rachiopagus.
rachis
SYN: vertebral column. [G. spine, backbone]
rachischisis
1. Embryologic failure of fusion of vertebral arches and neural tube with consequent exposure of neural tissue at the surface; spina bifida cystica with myelocele or ...
rachitic
Relating to or suffering from rickets (rachitis). SYN: rickety.
rachitis
SYN: rickets. [G. rhachitis] - r. fetalis congenital rickets. SYN: r. intrauterina, r. uterina. - r. fetalis annularis congenital enlargement of the epiphyses of the long ...
rachitism
A rachitic state or tendency.
rachitogenic
Producing or causing rickets. [ rachitis + G. genesis, production]
rachitome
SYN: rachiotome.
Racoon roundworm infection
Infection by the raccoon roundworm is also called Baylisascaris. The species commonly found in raccoonsis Baylisascaris procyonis. When infective eggs of this roundworm are ...

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