SYN: lye. [L. ntr. of lixivius, made into lye]
Only two types of lizards are poisonous: the Gila monster that lives in Arizona and Mexico and the beaded lizard of Mexico. Symptoms from their bites of these include pain, ...
LKS (Landau-Kleffner syndrome)
A disorder with seizures starting in childhood in which the patient loses skills, such as speech, and develops behavior characteristic of autism. A major feature of LKS is the ...
Abbreviation for lysolecithin-lecithin acyltransferase.
Abbreviation for large loop excision of transformation zone of the cervix of the uterus.
Acronym for the left lower lobe (of the lung). The left lung has but two lobes. The other lobe is the left upper lobe (LUL). The right lung has three lobes: the right lower lobe ...
John Uri, U.S. pharmacist, 1849–1936. Noted for investigational work in plant chemistry and phytochemistry as applied to medicines, alkaloids, and glucosides.
Abbreviation for the left lower quadrant (quarter). The LLQ of the abdomen contains the descending portion of the colon. (By contrast, RUQ stands for the right upper quadrant, ...
Abbreviation for licentiate in midwifery.
Abbreviation for lumen (2).
Abbreviation for left mentoanterior position.
Abbreviation for " last menstrual period." By convention, pregnancies are dated in weeks starting from the first day of a woman's last menstrual period (LMP). If her menstrual ...
Abbreviation for left mentotransverse position.
Abbreviation for lymph node permeability factor.
Abbreviation for left occipitoanterior position.
The eye worm, a parasite that lives in humans and other primates. People contract the parasite when bitten by infected deer flies. The larvae of the worm enter the bloodstream ...
1. A departure from normal body content, as of water, salt, or heat; positive loads are quantities in excess of the normal; negative loads are quantities in deficit. 2. The ...
Administration of a substance for the purpose of testing metabolic function.
- carbohydrate l. a procedure, popular with long-distance runners and other athletes, of filling ...
Having to do with a lobe. For example, lobar pneumonia.
* * *
Relating to any lobe.
- l. nephronia 1. a focal renal mass related to acute infection. 2. acute focal bacterial ...
1. Divided into lobes. 2. Lobe-shaped; denoting a bacterial colony with a deeply undulate margin. SYN: lobose, lobous.
1. One of the subdivisions of an organ or other part, bounded by fissures, sulci, connective tissue septa, or other structural demarcations. 2. A rounded projecting part, as the ...
: An operation done to remove a lobe of an organ such as the lobe of a lung or a lobe of the thyroid gland. The lung has 5 lobes — 3 on the right and 2 on the right. A lobectomy ...
1. The dried leaves and tops of L. inflata (family Lobeliaceae); it contains several alkaloids: lobeline, lobelamine, lobelanidine, lobelanine, norlobelanine, norlobelanidine, ...
A piperidylacetophenone; an alkaloid of lobelia with the same actions as nicotine, but with less potency.
- l. sulfate a form of l. occurring in yellow friable masses, ...
Plural of lobus. [L.]
Jorge, Brazilian physician, 1900–1979. See L. disease.
A species of fungus causing lobomycosis. The organism has not been grown in culture.
A chronic localized mycosis of the skin reported from South America resulting in granulomatous nodules or keloids that contain budding, thick-walled cells about 9 μm in ...
A thick lobose pseudopodium. [G. lobos, lobe, + pous, foot]
1. Incision into a lobe. 2. Division of one or more nerve tracts in a lobe of the cerebrum. [G. lobos, lobe, + tome, a cutting]
- prefrontal l. division of one or more nerve ...
Lobry de Bruyn
Cornelius A., Dutch chemist, 1857–1904. See L.-van Ekenstein transformation.
Johann F.D., German pathologist, 1777–1840. See L. ganglion.
Osteogenesis imperfecta type I. An inherited, generalized connective tissue disorder featuring bone fragility and blue sclerae (blue whites of the eyes). The classic mild form ...
A small lobe or subdivision of a lobe. SYN: lobulus [TA].
- ala central l. [TA] SYN: wing of central l.. SYN: pars inferior alae lobuli centralis [TA], pars superior ali lobuli ...
SYN: lobule. [Mod. L. dim. of lobus, lobe]
- l. auriculae [TA] SYN: lobule of auricle.
- l. biventer [TA] SYN: biventer lobule.
- l. biventralis SYN: biventer lobule.
- l. ...
SYN: lobe. [LL. fr. G. lobos]
- l. anterior hypophyseos [TA] SYN: adenohypophysis.
- l. appendicularis SYN: Riedel lobe.
- l. azygos pulmonis dextri SYN: azygos lobe of right ...
Abbreviation for low osmolar contrast agent.
Having reference or confined to a limited part; not general or systemic. [L. localis, fr. locus, place]
: Treatment that affects only a tumor and the area close to it.
: Treatment that affects the tumor and the area close to it.
1. Limitation to a definite area. 2. The reference of a sensation to its point of origin. 3. The determination of the location of a morbid process.
- auditory l. in sensory ...
Restricted or limited to a definite part.
A number or letter preceding a substituent name in the name of a complex chemical that specifies the position (location) of the substituent on the parent molecule; e.g., 5 in ...
An instrument or apparatus for finding the position of a foreign object in tissue.
The fluid that weeps from the vagina for a week or so after delivery of a baby. At first the lochia is primarily blood, followed by a more mucousy fluid containing dried blood, ...
Distention of the uterus with retained lochia. [G. metra, womb]
SYN: lochiorrhea. [ lochia + G. rhegnymi, to burst forth]
Profuse flow of the lochia. SYN: lochiorrhagia. [ lochia + G. rhoia, a flow]
A device for holding or closing.
- English l. articulation of the blades of obstetrical forceps consisting of a socket on the shank at the junction with the handle in a ...
Frank S., British physiologist, 1871–1949. See Cabot-L. murmur, L. solutions, under solution, L.- Ringer solution.
A neurological disorder characterized by complete paralysis of voluntary muscles in all parts of the body except for those that control eye movement. The locked-in syndrome is ...
Charles B., English anatomist and surgeon, 1858–1914. See L. ligament.
Abbreviation for low osmolar contrast medium.
Movement from one place to another. And the ability to locomote, to get from one place to the next. The locomotive system permits locomotion and consists of bones that are the ...
The system that permits locomotion, movement from one place to another. The key components of this system are: the bones that are the framework of the skeleton, the joints that ...
Relating to locomotion, or movement from one place to another. SYN: locomotive, locomotory. [L. locus, place, + L. moveo, pp. motus, to move]
The locomotor apparatus of the body. [L. locus, place, + motorius, moving]
1. A loculate region in an organ or tissue, or a loculate structure formed between surfaces of organs, mucous or serous membranes, and so on. 2. The process that results in the ...
A small cavity or chamber. [L. dim. of locus, place]
A temporary substitution of one physician by another. SYN: locum tenens. [partial anglicization of locum tenens]
The place, in Latin.. In genetics, a locus is the place a gene occupies on a chromosome. One locus, two loci.
* * *
1. A place; usually, a specific site. 2. The position that a ...
Locus minoris resistentiae
Latin meaning a place of less resistance. A locus minoris resistentiae offers little resistance to microorganisms. For example, a damaged heart valve acts as a locus minoris ...
In genetics, a statistical estimate of whether two loci (the sites of genes) are likely to lie near each other on a chromosome and are therefore likely to be inherited together as ...
Leo, U.S. pathologist, 1869–1959. See L. deciduoma.
Friedrich A.J., German bacteriologist and surgeon, 1852–1915. See L. bacillus, L. blood culture medium, L. stain, L. caustic stain, L. methylene blue, Klebs-L. bacillus, L. ...
Moritz, Austrian pathologist, 1851–1918. See L. cell.
Wilhelm, German physician, 1850–1894. See L. bundle, L. reaction, L. tract.
A potent, long-lasting narcotic and analgesic that is chemically related to fentanyl.
Wilhelm, Swiss physician, 1887–1972. See L. disease, L. endocarditis, L. parietal fibroplastic endocarditis, L. syndrome.
William H.G., early 20th century U.S. plastic surgeon. See L. bow.
If a number, x, is expressed as a power of another number, y, i.e., if x = yn, then n is said to be the l. of x to base y. Common logarithms are to the base 10; natural or ...
A method of photographic printing in which fine details are emphasized by electronic enhancement of their contrast; formerly used for reproducing radiographic images.
The logarithm of the ratio of frequencies of two different categorical and mutually exclusive outcomes such as healthy and sick.
A branch of science concerned with the physiology and pathology of the organs of speech and with the correction of speech defects. SYN: logopedia. [logo- + G. pais (paid-), ...
Rarely used term for abnormal or pathologic talkativeness or garrulousness. [logo- + G. rhoia, a flow]
1. SYN: stuttering. 2. SYN: explosive speech. [logo- + G. spasmos, spasm]
A form of psychotherapy which places special emphasis on the patient's spiritual life and on the physician as “medical minister.” [logo- + G. therapeia, cure]
The disease caused by the eye worm known as loa loa, a parasite that lives in humans and other primates. People contract the parasite when bitten by infected deer flies. The ...
The portion of the lower back from just below the rib cage to the pelvis. The loins include the psoas muscles which are very powerful muscles in the lower back. The term "loin" ...
Poisoning by the seeds of a grass, Lolium temulentum (in the form of flour made into bread), characterized by giddiness, tremor, green vision, dilated pupils, prostration, and ...
Etienne, French physician, 1868–1920. See L. voice-reflex test.
An antineoplastic agent. SYN: CCNU.
Loneliness, fear of
An abnormal and persistent fear of loneliness, of being alone. Sufferers of this fear experience undue anxiety even though they realize that being alone does not threaten their ...
John H., U.S. physician, 1856–1927. See L. coefficient, L. formula.
Long arm of a chromosome
The long arm of a chromosome is termed the q arm. All human chromosomes have 2 arms, the p (short) arm and the q (long) arm. They are separated from each other only by a primary ...
Long QT syndrome
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 ...
Long QT syndrome (LQTS)
A genetic (inherited) condition that predisposes individuals to irregular heartbeats (arrhythmias), fainting spells and sudden death. The irregular heartbeats are typically ...
long-chain fatty acid-CoA ligase
Fatty acid thiokinase (long-chain), a ligase forming acyl-CoA, AMP, and pyrophosphate from long-chain fatty acid s, ATP, and coenzyme A. SYN: acyl-activating enzyme (1), ...
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 ...
Lifespan. (With increasing longevity, women will soon be postmenopausal for one third of their lives).
* * *
Duration of a particular life beyond the norm for the species. SEE ...
The word come from the Latin longitudo meaning length. Hence, longitudinal means along the length, running lengthwise, or (by extension) over the course of time.
* * *
1. Running ...
A section that is cut along the long axis of a structure. The opposite is a cross section.
A study done over the passage of time. For example, a longitudinal study of children with Down syndrome (trisomy 21) might involve the study of 100 children with this condition ...
William P., Jr., U.S. surgeon, 1913–1977. See L. operation.
Joseph M., U.S. biochemist, *1896. See Folin-L. test.
1. A sharp curve or complete bend in a vessel, cord, or other cylindrical body, forming an oval or circular ring. SEE ALSO: ansa. 2. A wire (usually of platinum or nichrome) ...
loosening of association
A manifestation of a severe thought disorder characterized by the lack of an obvious connection between one thought or phrase and the next, or with the response to a question.
Emil, Swiss physician, 1877–1936. See L. zones, under zone.
Abbreviation for left occipitoposterior position.
Congenital abnormality of the external ear, with poor development of helix and anthelix. SYN: bat ear.
Having the crowns of the molar teeth formed in transverse or longitudinal crests or ridges, in contrast to bunodont. [G. lophos, ridge, + odous, tooth]
The botanical origin of peyote (mescal button); it contains over a dozen alkaloids, of which mescaline is the most important; others are pellotine, anhalomine, anhalonidine, ...
Referring to a bacterial cell with two or more flagella at one or both poles. SYN: lophotrichate. [G. lophos, crest, + thrix, hair]
Paul, French physician, 1827–1875. See L. disease, L.- Lévi dwarfism, L.- Lévi infantilism, L.- Lévi syndrome.
An antianxiety drug of the benzodiazepine group.
An antiarrhythmic agent used for the treatment of ventricular arrhythmias; much like a cardiac depressant (antiarrhythmic).
Combined backward and lateral curvature of the spine. [G. lordos, bent back, + skoliosis, crookedness, fr. skolios, bent, aslant]
Inward curvature of the spine. Normally, for example, the low back demonstrates lordosis. The spine is not supposed to be absolutely straight, so some degree of curvature is ...
Pertaining to or marked by lordosis.
Adolf, Austrian surgeon, 1854–1946. See L. sign.
Joseph (Johann), Czech chemist and physicist, 1821–1895. See L. number.
Abbreviation for left occipitotransverse position.
A class of pharmacopeial preparations that are liquid suspensions or dispersions intended for external application; some consist of finely powdered, insoluble solids held in ...
Lou Gehrig disease
Amyotrophic lateral sclerosis (ALS), a classic motor neuron disease. Motor neuron diseases are progressive chronic diseases of the nerves that come from the spinal cord ...
Pierre C.A., French physician, 1787–1872. See L. angle, L. law.
Denise, mid-20th century French physician. See Louis-Bar syndrome.
A magnifying lens. [Fr.]
- binocular l. a magnifying device, attached to spectacles or a headband, worn as a visual aid when performing operations on small structures.
Common name for members of the ectoparasitic insect orders Anoplura (sucking lice) and Mallophaga (biting lice). Important species are Felicola subrostrata (cat l.), Goniocotes ...
A severe acute disease with prolonged high fever up to 40° C (104° F), intractable headache, and a pink-to-red raised rash. The cause is a microorganism called Rickettsia ...
A cholesterol-lowering agent, isolated from a strain of Aspergillus terreus, that reduces both normal and elevated serum cholesterol. SYN: mevinolin.
Otto C., Swedish physician, 1835–1904. See L. reflex.
J.L., 20th century English dermatologist. See L. angle, L. profile sign.
Low back pain
Pain in the lower back area that can relate to problems with the lumbar spine, the discs between the vertebrae, the ligaments around the spine and discs, the spinal cord and ...
Low blood pressure
Any blood pressure that is below the normal expected for an individual in a given environment. Low blood pressure is also referred to as hypotension. Low blood pressure is a ...
Location of the placenta in the lower part of the uterus (womb) so that the placenta partially or completely covers the cervix. Also known as a placenta previa.
An ear positioned below its normal location. Classified as a minor anomaly. Technically, the ear is low-set when the helix (of the ear) meets the cranium at a level below that of ...
Charles U., U.S. pediatrician, *1921. See L. syndrome, L.-Terrey- MacLachlan syndrome.
Benjamin B., French laryngologist, 1836–1905. See L. canal, L. forceps, L. scala.
SYN: inferior. See L. ring, L. tubercle.
Lower GI series
: A series of x-rays of the colon and rectum that is taken after the patient is given a barium enema. (Barium is a white, chalky substance that outlines the colon and rectum on ...
The lower leg is the bottom segment of the leg: the part below the knee. The lower leg contains two long bones. The larger of these two bones is the tibia, the smaller one the ...
Bernard, U.S. cardiologist, *1921. See L.-Ganong- Levine syndrome.
Oliver H., U.S. biochemist, *1910. See L.- Folin assay, L. protein assay.
R. Brian, 20th century Irish medical geneticist in Canada. See Coffin-L. syndrome.
Oswald S., U.S. urologist, 1884–1955. See L. tractor.
2-Chloro-11-(4-methyl-1-piperazinyl)dibenz[b,f][1,4]-oxazepine; a neuroleptic antipsychotic agent used as the succinate and hydrochloride salts.
A genus of venomous spiders, the brown spiders, marked by a fiddle-shaped pattern on the cephalothorax, and found chiefly in South America. They inflict a highly ulcerative, ...
A clinical illness produced by the brown recluse spider, Loxosceles reclusus, of North America; characterized by gangrenous slough at the site of the bite, nausea, malaise, ...
Former name for Metagonimus yokogawai. [G. loxos, slanting, + trema, a hole; L. ovatus, egg-shaped]
SYN: troche. [Fr. losange, fr. lozangé, rhombic]
LP (lumbar puncture)
Also known as a spinal tap, an LP is a procedure whereby spinal fluid is removed from the spinal canal for the purpose of diagnostic testing. It is particularly helpful in the ...
Abbreviation for lipotropic hormone.
Abbreviation for left posterior oblique, a radiographic projection.
Abbreviation for lipopolysaccharide.
Symbol for lawrencium.
Abbreviation for luteinizing hormone-releasing factor.
Abbreviation for luteinizing hormone-releasing hormone.
Abbreviation for left sacroanterior position.
Lower segment Cesarian section. A Cesarian section in which the surgical incision (cut) is made in the lower segment of the uterus.
Abbreviation for lysergic acid diethylamide.
Abbreviation for line spread function.
Abbreviation for low-grade squamous intraepithelial lesion.
Abbreviation for left sacroposterior position.
Abbreviation for left sacrotransverse position.
Abbreviation for leukotrienes, usually followed by another letter with a subscript number; e.g., LTA4, LTC4.
Abbreviation for long-term memory.
Abbreviation for laser trabeculoplasty.
Abbreviation for long terminal repeat sequences, under sequence.
Otto, German pathologist, 1860–1933. See L. crystals, under crystal.
: An oily or slippery substance. A vaginal lubricant may be helpful for women who feel pain during intercourse because of vaginal dryness.
Henri, French laryngologist, 1855–1925. See L. operation, Caldwell-L. operation, Ogston-L. operation.
Used in the treatment of urinary schistosomiasis (Schistosoma haematobium) and intestinal schistosomiasis (S. mansoni).
Richard C., English anatomist and surgeon, 1846–1915. See L. groove.
An antibiotic isolated from cultures of Streptomyces lucensis; an antifungal agent. SYN: lucimycin.
Bright; clear; translucent. [L. luceo, to shine]
Clear, not obscured or confused, as in a l. moment or l. spoken expression. [L. lucidus, clear]
SYN: clarification. [L. lucidus, clear, + facio, to make]
The quality or state of being lucid.
Enzymes present in certain luminous organisms that act to bring about the oxidation of luciferins; energy produced in the process is liberated as bioluminescence; such enzymes ...
Chemical substances present in certain luminous organisms that, when acted upon by luciferases, produce bioluminescence. [L. lux, light + fero. to bear]
Avoiding light. [L. lux, light, + fugio, to flee from]
A genus of scavenging blowflies (family Calliphoridae), commonly called bluebottle or greenbottle flies, whose larvae feed on carrion or excrement; they occasionally cause wound ...
R., Mexican physician, 1819–1866. See L. leprosy, L. leprosy phenomenon.
Seeking light. [L. lux, light, + peto, to seek]
Balduin, U.S. pathologist, 1889–1954. See Lucké virus.
George A., German surgeon, 1829–1894. See L. test.
Craniolacunia with meningocele or encephalocele. [Ger. Lücke, gap + Schädel, skull]
Daniel, German anatomist, 1625–1680. See L. angle.
Karl F.W., German anatomist and physiologist, 1816–1895. See depressor nerve of L., L. ganglion, L. labyrinth, L. nerve, L. ...
German instrument maker, †1883. See L. syringe, L.-Lok syringe.
A plague or pestilence; specifically, syphilis. [L. pestilence]
- l. venerea SYN: syphilis.
Lues (pronounced Lou-ease) is an old name for syphilis, a sexually transmitted disease (STD) that has been around for centuries and is caused by Treponema pallidum, a ...
John H., U.S. histologist, *1927. See L. potassium permanganate fixative.
Rolf, Swedish endocrinologist, *1914. See L. disease.
Jean G.A., French physician, 1786–1851. See L. iodine solution.
L.J., 20th century U.S. pathologist. See L.-Collins classification.
Acronym for the left upper lobe (of the lung). The left lung has but two lobes. The other lobe is naturally the left lower lobe (LLL). The right lung has three lobes: the right ...
A decapeptide hormone from the hypothalamus that stimulates the anterior pituitary to release both follicle-stimulating hormone and luteinizing hormone; gonadotropin-releasing ...
Pain in mid and lower back; a descriptive term not specifying cause. [L. fr. lumbus, loin]
- ischemic l. an ischemic form of backache characterized by a painful cramp of the ...
Referring to the 5 lumbar vertebrae which are situated below the thoracic vertebrae and above the sacral vertebrae in the spinal column. The 5 lumbar vertebrae are represented by ...
A lumbar puncture or "LP" is a procedure whereby spinal fluid is removed from the spinal canal for the purpose of diagnostic testing. It is particularly helpful in the ...
A congenital anomaly of the lumbosacral junction characterized by development of the first sacral vertebra as a lumbar vertebra, resulting in six lumbar vertebrae instead of ...
Plural of lumbus. [L.]
1. Relating to the lumbar and the hypochondriac regions. 2. Relating to the lumbar vertebrae and the ribs; denoting a ligament connecting the first lumbar vertebra with the neck ...
Relating to the lumbar and the inguinal regions. SYN: lumboiliac. [L. lumbus, loin, + inguen (inguin-), groin]
Relating to the lumbar vertebrae and the sacrum. SYN: sacrolumbar.
SYN: lumbricoid (1). [L. lumbricus, earthworm]
See lumbricals ( lumbrical muscles) of hand, under muscle, lumbricals ( lumbrical muscles) of foot, under muscle.
Destructive to lumbricoid (intestinal) worms.
An agent that kills lumbricoid (intestinal) worms. [L. lumbricus, worm, + caedo, to kill]
1. Denoting or resembling a roundworm, especially Ascaris lumbricoides. SYN: lumbrical, lumbricus (1). SEE ALSO: scolecoid (2), vermiform. 2. Obsolete common name for ...
1. SYN: lumbricoid (1). 2. Obsolete name for Ascaris lumbricoides. [L. earthworm]
A luminous term referring to the channel within a tube such as a blood vessel or to the cavity within a hollow organ such as the intestine. Lumen is a luminous term because it ...
7,8-Dimethylalloxazine; riboflavin minus its ribityl side chain; produced by ultraviolet irradiation of riboflavin in acid solution.
7,8,10-Trimethylisoalloxazine; a yellow photoderivative of riboflavin, bearing a methyl group in place of the ribityl; produced by ultraviolet irradiation of riboflavin in ...
Relating to the lumen of a blood vessel or other tubular structure. SYN: luminalis [TA].
The brightness of an object, expressed as the luminous flux per unit solid angle per unit projected area, measured in lamberts or in candelas per square meter. [L. lumino, to ...
Emission of light from a body as a result of a chemical reaction. See bioluminescence. [L. lumen, light]
Producing or conveying light. [L. lumen, light, + fero, to carry]
An atom or atomic grouping in an organic compound that increases its ability to emit light. [L. lumen, light, + G. phoros, bearing]
Emitting light, with or without accompanying heat. [L. lumen, light]
An intermediate between rhodopsin and all-trans-retinal plus opsin during bleaching of rhodopsin by light; formed from bathorhodopsin and converted to metarhodopsin I with a ...
1. A by-product in ergocalciferol biosynthesis. 2. A phosphorylated derivative of ribulose that is an intermediate in the pentose monophosphate shunt.
The surgical removal of a small tumor (a lump) which may or may not be benign (or malignant). Lumpectomy has come to refer specially to the removal of a lump from the breast. The ...
Lee G., 20th century U.S. medical technologist. See L.- Ishak stain.
1. An obsolete term for a form of insanity characterized by alternating lucid and insane periods, believed to be influenced by phases of the moon. 2. Any form of insanity. ...
1. Relating to the moon or to a month. 2. Resembling the moon in shape, especially a half moon. SYN: lunate (1) [TA], semilunar. SEE ALSO: crescentic. 3. Relating to ...
1. SYN: lunar (2). 2. Relating to the l. bone.
Obsolete term for a mentally ill person. [see lunacy]
One of a pair of viscera occupying the pulmonary cavities of the thorax, the organs of respiration in which aeration of the blood takes place. In humans, the right l. is slightly ...
The first lung transplant was done by the American surgeon James Hardy (1918-) in 1964.