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leukocytotoxin
Any substance that causes degeneration and necrosis of leukocytes, including leukolysin and leukocidin. SYN: leukotoxin. [leukocyte + G. toxikon, poison]
leukocyturia
The presence of leukocytes in urine that is recently voided or collected by means of a catheter. [leukocyte + G. ouron, urine]
leukoderma
An absence of pigment, partial or total, in the skin. SYN: hypomelanosis, leukopathia, leukopathy. [leuko- + G. derma, skin] - acquired l. SYN: vitiligo. - l. acquisitum ...
leukodermatous
Relating to or resembling leukoderma.
leukodontia
The condition of having white teeth. [leuko- + G. odous, tooth]
leukodystrophia
SYN: leukodystrophy. - l. cerebri progressiva SYN: leukodystrophy.
Leukodystrophy
A disorder of the white matter of the brain, the part of the brain that contains myelinated nerve fibers. The white matter is white because it is the color of myelin, the ...
leukoencephalitis
Encephalitis restricted to the white matter. - acute epidemic l. a disease characterized by acute onset of fever, followed by convulsions, delirium, and coma, and associated with ...
leukoencephalopathy
White matter changes first described in children with leukemia, associated with radiation and chemotherapy injury, often associated with methotrexate; pathologically ...
Leukoencephalopathy with vanishing white matter
An inherited brain disease that occurs mainly in children. and follows a chronic progressive course with additional episodes of rapid deterioration following stress from febrile ...
leukoerythroblastosis
Any anemic condition resulting from space-occupying lesions in the bone marrow; the circulating blood contains immature cells of the granulocytic series and nucleated red blood ...
leukokinetic
Pertaining to leukokinetics. [leukocyte + G. kinetikos, of motion, fr. kineo, to move]
leukokinetics
The study of the formation, circulation, and fate of leukocytes, usually by use of a radioactive tracer. [leukocyte + G. kinetikos, of or for putting in motion]
leukokoria
See leukocoria.
leukokraurosis
SYN: kraurosis vulvae.
leukolysin
SYN: leukocytolysin.
leukolysis
SYN: leukocytolysis.
leukolytic
SYN: leukocytolytic.
leukoma
A dense white opacity of the cornea. [G. whiteness, a white spot in the eye, fr. leukos, white] - adherent l. a cicatrix of the cornea to which a portion of the iris is ...
Leukomalacia, cystic periventricular
Softening of the white matter near the ventricles of the brain resulting in abnormal cysts. Cystic periventricular leukomalacia is a major problem in very premature infants. ...
leukomatous
Pertaining to leukoma.
leukomyelitis
An inflammatory process involving the white matter of the spinal cord. - necrotizing hemorrhage l. the pathological substrate responsible for the clinical disorder of acute ...
leukomyelopathy
Any systemic disease involving the white matter or the conducting tracts of the spinal cord. [leuko- + G. myelos, marrow, + pathos, suffering]
leukon
The total mass of circulating leukocytes as well as the cells and leukopoietic cells from which it originates.
leukonecrosis
SYN: white gangrene. [leuko- + G. nekrosis, deadness]
leukonychia
The occurrence of smooth-surfaced white spots or patches under the nails, of unknown cause; the decoloration may be total or in the form of lines ( striate or transverse l.) or ...
leukopathia, leukopathy
SYN: leukoderma. [leuko- + G. pathos, disease]
leukopedesis
The movement of white blood cells (especially polymorphonuclear leukocytes) through the walls of capillaries and into the tissues. [leuko- + G. pedesis, a leaping]
leukopenia
The antithesis of leukocytosis; any situation in which the total number of leukocytes in the circulating blood is less than normal, the lower limit of which is generally regarded ...
leukopenic
Pertaining to leukopenia.
leukoplakia
A white patch of oral or female genital mucous membrane that cannot be wiped off and cannot be diagnosed clinically as any specific disease entity; in current usage, a clinical ...
leukopoiesis
Formation and development of the various types of white blood cells. SYN: leukocytopoiesis. [leuko- + G. poiesis, a making]
leukopoietic
Pertaining to or characterized by leukopoiesis, as manifested by portions of the bone marrow and reticuloendothelial and lymphoid tissues, which form (respectively) the ...
leukoprotease
An ill-defined proteolytic enzyme product of polynuclear leukocytes, formed in an area of inflammation, that causes liquefaction of dead tissue.
leukoriboflavin
The colorless nonfluorescing dihydro compound formed by the reduction of riboflavin.
leukorrhagia
SYN: leukorrhea. [leuko- + G. rhegnymi, to burst forth]
leukorrhea
Discharge from the vagina of a white or yellowish viscid fluid containing mucus and pus cells. SYN: leukorrhagia. [leuko- + G. rhoia, flow] - menstrual l. intermittent l. ...
leukorrheal
Relating to or characterized by leukorrhea.
leukotactic
SYN: leukocytotactic.
leukotaxia
SYN: leukocytotaxia.
leukotaxine
A cell-free nitrogenous material prepared from injured, acutely degenerating tissue and from inflammatory exudates.
leukotaxis
SYN: leukocytotaxia.
leukotome
An instrument for performing leukotomy.
leukotomy
Incision into the white matter of the frontal lobe of the brain. [leuko- + G. tome, a cutting] - prefrontal l. SYN: prefrontal lobotomy. - transorbital l. SYN: transorbital ...
leukotoxin
SYN: leukocytotoxin.
leukotrichia
Whiteness of the hair. [leuko- + G. thrix, hair]
leukotrienes
Products of eicosanoid metabolism (usually, arachidonic acid) with postulated physiologic activity such as mediators of inflammation and roles in allergic reactions; they differ ...
Leukovirus
Obsolete term for a former genus composed of the RNA tumor viruses now included in the family Retroviridae.
leupeptin
One of a number of modified tripeptide protease inhibitors from Streptomyces species that inhibits cathepsin B, papain, trypsin, plasmin, and cathepsin D. The most commonly ...
leuprolide acetate
A synthetic nonapeptide analog of naturally occurring gonadotropin-releasing hormone; used in the palliative treatment of advanced prostatic cancer.
leurocristine
SYN: vincristine sulfate.
Lev
Maurice, U.S. pathologist, 1908–1994. See L. disease, L. syndrome.
Levaditi
Constantin, Romanian bacteriologist in Paris, 1879–1928. See L. stain.
levallorphan tartrate
The N-allyl analog of levorphanol, antagonistic to the actions of narcotic analgesics; used in the treatment of respiratory depression due to overdosage of narcotics.
levamisole
Formerly used as an anthelmintic; increases immune responses and is used adjunctively with antineoplastic agents to improve response and suppress recurrence.
levan
SYN: fructosan (1).
levansucrase
An enzyme catalyzing transfer of the fructose moiety of sucrose to polyfructose (a levan), releasing d-glucose.
levarterenol
SYN: norepinephrine. - l. bitartrate SYN: norepinephrine bitartrate.
levator
1. A surgical instrument for prying up the depressed part in a fracture of the skull. 2. One of several muscles whose action is to raise the part to which it inserts. [L. a ...
LeVeen
Harry H., U.S. surgeon, *1914. See L. shunt.
level
1. Any rank, position, or status in a graded scale of values. 2. A test for determining such rank or position. - acoustic reference l. the biological reference l. for sound ...
Level 1 biosafety
The lowest level of biosafety, a level that applies to agents that do not ordinarily cause human disease. A biosafety level is a specific combination of work practices, safety ...
Level 2 biosafety
A level of biosafety considered appropriate for agents that can cause human disease, but whose potential for transmission is limited. A biosafety level is a specific combination ...
Level 3 biosafety
A level of biosafety considered appropriate for agents that may be transmitted by the respiratory route which can cause serious infection. A biosafety level is a specific ...
Level 4 biosafety
The highest level of biosafety. This level is used for the diagnosis of exotic agents such as the Ebola virus that pose a high risk of life-threatening disease, which may be ...
Leventhal
Michael L., U.S. obstetrician-gynecologist, 1901–1971. See Stein-L. syndrome.
lever
An instrument used to lift or pry. [Fr. l., to lift] - dental l. SYN: elevator (2).
leverage
1. The actual lift or elevating direction of a lever or elevator. 2. The mechanical advantage gained thereby.
Levey
S., 20th century U.S. statistician. See L.-Jennings chart.
Lévi
E. Leopold, French endocrinologist, 1868–1933. See dominantly inherited L. disease, Lorain-L. dwarfism, Lorain-L. infantilism, Lorain-L. syndrome.
Levin
Abraham, U.S. physician, 1880–1940. See L. tube. Max, U.S. neurologist, *1901. See Kleine-L. syndrome.
Levine
Samuel A., U.S. cardiologist, 1891–1966. See Lown-Ganong-L. syndrome.
Levinea
A former genus of bacteria (of the family Enterobacteriaceae) whose species are now assigned to the genus Citrobacter. [Max Levine, U.S. bacteriologist, *1889] - L. amalonatica ...
levitation
Support of the patient on a cushion of air. [L. levitas, lightness]
Leviviridae
Provisional name for a family of small, nonenveloped, isometric bacterial viruses with genomes of single-stranded positive sense RNA (MW 1 × 106). Virions adsorb to the sides ...
levo-
Left, toward or on the left side. [L. laevus]
Levo- (prefix)
From the Latin "laevus" meaning on the left side. For example, a molecule that shows levorotation is turning or twisting to the left. The opposition of levo- is dextro- (from ...
levobunolol hydrochloride
A β-adrenergic blocking agent used primarily as an eye drop in the treatment of chronic open-angle glaucoma and ocular hypertension.
Levocardia
Reversal of all of the abdominal and thoracic organs (situs inversus) except the heart which is still in its usual location on the left. This situation is far more of an anatomic ...
levocardiogram
That part of the electrocardiogram that is the effect of the left ventricle.
levocarnitine
Used as a supplement for carnitine deficiency.
levoclination
SYN: levotorsion (2). [ levo- + L. clino, pp. -atus, to bend]
levocycleduction
SYN: sinistrotorsion.
levocycloduction
levotorsion of one eye. [ levo- + cyclo- + L. duco, pp. ductus, to lead]
levodopa
The biologically active form of dopa; an antiparkinsonian agent that is converted to dopamine. SYN: l-dopa.
levoduction
Turning of one eye to the left; abduction of left eye or adduction of right eye. [ levo- + L. duco, pp. ductus, to lead]
levoform
Denoting the structure of a substance that rotates the plane of polarized light counterclockwise (left); that is, as viewed by the observer looking toward the light source.
levoglucose
d-Fructose. See fructose.
levogram
Electrocardiographic record in an experimental animal representing spread of impulse through the left ventricle alone.
levogyrate, levogyrous
SYN: levorotatory. [ levo- + L. gyro, to turn in a circle]
levonordefrin
Used as a nasal decongestant and as a vasoconstrictor given with infiltration anesthetics.
levophacetoperane
An antidepressant with anorexigenic properties.
levophobia
Fear of objects to the left.
levorotation
1. A turning or twisting to the left; in particular, the counterclockwise twist given the plane of plane-polarized light by solutions of certain optically active substances. ...
levorotatory
1. Denoting levorotation, or certain crystals or solutions capable of causing it; as a chemical prefix, usually abbreviated l- or (−). Cf.:dextrorotatory. 2. Describing any ...
levorphanol tartrate
An analgesic similar in action to morphine.
Levothyroxine sodium
A synthetic thyroid hormone used as a thyroid hormone replacement drug (brand names include Eltroxin, Levothroid, Levoxine, Levoxyl, Synthroid) used to treat an underactive ...
levotorsion
1. SYN: sinistrotorsion. 2. Rotation of the upper pole of the cornea of one or both eyes to the left. SYN: levoclination. [ levo- + L. torsio, a twisting]
levoversion
1. Version toward the left. 2. Conjugate turning of both eyes to the left. [ levo- + L. verto, pp. versus, to turn]
Levret
André, French obstetrician, 1703–1780. See L. forceps, Mauriceau-L. maneuver.
levulan
SYN: fructosan (1).
levulic acid
SYN: levulinic acid.
levulin
SYN: fructosan (1).
levulinate
A salt or ester of levulinic acid.
levulinic acid
4-Oxopentanoic acid; formed by the action of hot, strong acids on hexoses. SEE ALSO: δ-aminolevulinic acid. SYN: levulic acid.
levulosan
SYN: fructosan (1).
levulose
d-Fructose. See fructose.
levulosemia
SYN: fructosemia.
levulosuria
SYN: fructosuria.
Lévy
Gabrielle, French neurologist, 1886–1935. See Roussy-L. disease, Roussy-L. syndrome.
Lewandowski
Felix, German dermatologist, 1879–1921. See Jadassohn-L. syndrome.
Lewis
Gilbert N., U.S. chemist, 1875–1946. SEE ALSO: L. acid, L. base, second law of thermodynamics. Ivor, Welsh surgeon who in 1946 reported to the Royal College of Surgeons a ...
Lewis Blood Group, Le Blood Group
See Blood Groups Appendix.
lewisite
A war gas. It is a vesicant, a lung irritant like mustard gas, a systemic poison entering the circulation through the lungs or skin, and a mitotic poison arresting mitosis in ...
Lewy, Lewey
Frederic H., German neurologist in the U.S., 1885–1950. See L. bodies, under body, L. body dementia, diffuse L. body disease.
lexical
Denoting the vocabulary of speech or language.
Leyden
Ernst V. von, German physician, 1832–1910. See L. ataxia, L. crystals, under crystal, L. neuritis, L.- Möbius muscular dystrophy.
Leydig
Franz von, German anatomist, 1821–1908. See L. cells, under cell, L. cell tumor, Sertoli-L. cell tumor.
leydigarche
Obsolete term for the beginning of gonadal function in the male, e.g., male puberty. [ Leydig (see Leydig cells), + G. arche, beginning]
Lf, Lf
See dose.
LFA
Abbreviation for left frontoanterior position; lymphocyte function associated antigen.
LFP
Abbreviation for left frontoposterior position.
LFT
Abbreviation for left frontotransverse position.
LGSIL
Abbreviation for low-grade squamous intraepithelial lesion.
LH
Abbreviation for luteinizing hormone.
LH-RF
Abbreviation for luteinizing hormone-releasing factor.
LH-RH
Abbreviation for luteinizing hormone-releasing hormone.
LH/FSH-RF
Abbreviation for luteinizing hormone/follicle-stimulating hormone-releasing factor.
Lhermitte
Jean, French neurologist, 1877–1959. See L. sign.
Lhermitte sign
Sudden transient electric-like shocks extending down the spine triggered by flexing the head forward. Due to a disorder such as compression of the cervical spine (the portion of ...
LHRH agonist
A compound that is similar to LHRH (luteinizing hormone-releasing hormone) in structure and is able to act like it. Luteinizing hormone-releasing hormone is a naturally occurring ...
Li
Frederick P., 20th century epidemiologist. See L.- Fraumeni cancer syndrome. Symbol for lithium.
Li-Fraumeni syndrome (LFS)
This is an extraordinary cancer family syndrome. People with LFS have a tendency to develop a great diversity of tumors. LFS was first discovered in 1969. By reviewing the medical ...
liberator
An agent that stimulates or activates a physiological chemical or an enzymatic action. - histamine liberators substances that cause the release of histamine from mast cells or ...
liberins
SYN: releasing factors. [L. libero, to free, + -in]
liberomotor
Relating to voluntary movements. [L. liber, free, + motor, mover]
libidinization
SYN: erotization.
libidinous
Lascivious; invested with or arousing sexual desire or energy. [L. libidinosus, fr. libido (libidin-), pleasure, desire]
Libido
1. Sexual drive. 2. In psychoanalysis, the psychic energy from all instinctive biological drives. Libido in Latin means "desire, longing, fancy, lust, or rut." Although the ...
Libman
Emanuel, U.S. physician, 1872–1946. See L.-Sacks endocarditis, L.-Sacks syndrome.
Liborius
Paul, 19th century Russian bacteriologist. See L. method.
Library
In genetics, a library is an unordered collection of clones (i.e., cloned DNA from a particular organism), whose relationship to each other can be established by physical ...
Library of Medicine, National (NLM)
The world's largest medical library, the U.S. National Library of Medicine (NLM) is part of the National Institutes of Health (NIH). The NLM has as its mission to collect, ...
Library, arrayed
In genetics, arrayed libraries of DNA clones are used for many purposes, including screening for a specific gene or genomic region of interest as well as for physical mapping. ...
Library, cDNA
A collection of DNA sequences generated from mRNA (messenger RNA) sequences. This type of DNA library contains only DNA that codes for proteins and does not include any ...
Library, genomic
A collection of DNA clones made from a set of randomly generated overlapping DNA fragments representing the entire genome of an organism. As a molecular genetic sequel to John ...
lice
Plural of louse.
Lice, head
The condition of being infested with lice is called pediculosis. Head lice (Pediculus humanus capitis) are parasitic insects found on the heads of people. Anyone can get head ...
Licensed clinical social worker
A licensed clinical social worker (L.C.S.W.) is trained in psychotherapy and helps individuals deal effectively with a variety of mental health and daily living problems to ...
lichen
A discrete flat papule or an aggregate of papules giving a patterned configuration resembling l. growing on rocks. [G. leichen, l.; a lichenlike eruption] - l. myxedematosus a ...
Lichen planus
A common skin disease with small itchy pink or purple spots on the arms or legs. The lesions (abnormal areas) on the skin in lichen planus are typically polygonal, flat (hence, ...
Lichenification
Thick, leathery skin, usually the result of constant scratching and rubbing. With prolonged rubbing or scratching, the outer layer of the skin (the epidermis) becomes ...
lichenin
A variety of polysaccharide obtained from Iceland moss; used as a demulcent. SYN: moss starch.
lichenoid
1. Resembling lichen. 2. Accentuation of normal skin markings observed in cases of chronic eczema. 3. Microscopically resembling lichen planus.
Lichtenberg figures
A fern-leaf pattern of reddish, painless marks on the skin that are a result of a skin reaction to a lightening strike. The pattern typically vanishes in a few hours or days. ...
Lichtenstein
Louis, U.S. physician, 1906–1977. See Jaffe-L. disease.
licorice
SYN: glycyrrhiza.
lid
SYN: eyelid. [A.S. hlid] - granular lids SYN: trachoma. - lower l. SYN: inferior eyelid. - upper l. SYN: superior eyelid.
Liddell
Edward G.T., English neurophysiologist, 1895–1981. See L.- Sherrington reflex.
lie
Relationship of the long axis of the fetus to that of the mother. - longitudinal l. that relationship in which the long axis of the fetus is longitudinal and roughly parallel to ...
lie detector
SYN: polygraph (2).
Lieberkühn
Johann N., German anatomist, 1711–1756. See crypts of L., under crypt, L. follicles, under follicle, L. glands, under gland.
lieberkühn
A concave reflector around the objective of a microscope, for the purpose of directing a concentrated beam of light on the material being examined. [J.N. L.]
Liebermann
Leo von S., Hungarian physician, 1852–1926. See Burchard-L. reaction, L.- Burchard test.
Liebermeister
Carl von, German physician, 1833–1901. See L. rule.
Liebig
Baron Justus von, German chemist, 1803–1873. See L. theory.
Liebow
Averill A., Austrian-U.S. pulmonary pathologist, 1911–1978. See usual interstitial pneumonia of L..
lien
spleen. [L.] - l. accessorius accessory spleen. - l. mobilis SYN: floating spleen. - l. succenturiatus SYN: accessory spleen.
lien-, lieno-
The spleen; most terms beginning thus are obsolete or obsolescent. See spleno-. [L. lien]
lienal
SYN: splenic.
lienculus
SYN: accessory spleen. [Mod. L. dim. of L. lien, spleen]
lienectomy
Obsolete term for splenectomy.
lienomedullary
SYN: splenomyelogenous. [lieno- + G. medulla, marrow]
lienomyelogenous
SYN: splenomyelogenous.
lienopancreatic
SYN: splenopancreatic.
lienorenal
SYN: splenorenal. [lieno- + L. ren, kidney]
lienteric
Relating to, or marked by, lientery.
lientery
Passage of undigested food in the stools. [G. leienteria, fr. leios, smooth, + enteron, intestine]
lienunculus
SYN: accessory spleen. [Mod. L. dim. of L. lien, spleen]
Liesegang
Ralph E., German chemist, 1869–1947. See L. rings, under ring.
Lieutaud
Joseph, French anatomist and pathologist, 1703–1780. See L. body, L. triangle, L. trigone, L. uvula.
life
1. Vitality, the essential condition of being alive; the state of existence characterized by such functions as metabolism, growth, reproduction, adaptation, and response to ...
life events
Occurrences in one's daily life, some of which act as stressors.
life-style
The set of habits and customs that is influenced by the lifelong process of socialization, including social use of substances such as alcohol and tobacco, dietary habits, ...
lifespan
1. The duration of life of an individual. 2. The normal or average duration of life of members of a given species. SEE ALSO: longevity.
Ligament
A ligament is a tough band of connective tissue that connects various structures such as two bones. "Ligament" is a fitting term; it comes from the Latin "ligare" meaning "to ...
Ligament, anterior cruciate
The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ...
Ligament, lateral collateral knee
The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ...
Ligament, medial collateral knee
The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ...
Ligament, posterior cruciate
The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ...
ligamenta
Plural of ligamentum. [L.]
ligamentopexis, ligamentopexy
Shortening of any ligament of the uterus. [ligament + G. pexis, fixation]
ligamentous
Relating to or of the form or structure of a ligament.
Ligaments, knee
Ligaments are strong, elastic bands of tissue that connect bone to bone. They provide strength and stability to the joint. Four ligaments connect the femur (the bone in the thigh) ...
ligamentum
SYN: ligament. [L. a band, tie, fr. ligo, to bind] - l. acromioclaviculare [TA] SYN: acromioclavicular ligament. - l. anococcygeum SYN: anococcygeal ligament. - l. anulare [TA] ...
ligand
1. Any individual atom, group, or molecule attached to a central metal ion by multiple coordinate bonds; e.g., the porphyrin portion of heme, the corrin nucleus of the B12 ...
ligandin
SYN: glutathione S-transferase.
ligase
Generic term for enzymes (EC class 6) catalyzing the joining of two molecules coupled with the breakdown of a pyrophosphate bond in ATP or a similar compound. SEE ALSO: ...
Ligate
To tie. As, for example, the surgeon ligated the artery. "Ligate" is a fitting term; it comes from the Latin "ligare" meaning "to bind or tie." * * * To apply a ligature. [L. ...
ligation
1. Application of a ligature. 2. The act of binding or annealing. [L. ligatio, fr. ligo, to bind] - blunt-end l. a reaction that joins two DNA duplexes directly at their blunt ...
ligator
An instrument used in the ligation of vessels in deep and nearly inaccessible parts.
Ligature
Material (silk, gut, wire, etc) used to ligate (to tie) something. Ligatures are used to tie off blood vessels. "Ligature" is from the Latin "ligare" meaning " to bind or ...
light
That portion of electromagnetic radiation (between 390 and 770 nm) to which the retina is sensitive ( wavelength range of 380–780 nm). SEE ALSO: lamp. [A.S. leoht] - cold l. ...
light green SF yellowish
An acid arylmethane dye, used as a cytoplasmic stain in plant and animal histology; fades badly in bright light.
Lightening
Not to be confused with a discharge of atmospheric electricity, lightening refers to the sensation that a pregnant woman feels when the baby drops. This is the time when the ...
Lightheadedness
A feeling you are “going to faint.” Lightheadedness is medically distinct from dizziness, unsteadiness, and vertigo. See: {{}}Dizziness, Unsteadiness, and Vertigo .
Lightning injuries
A major source of injury and death from the environment, lightning is one of the top 3 causes of death from environmental origins. (The other top environmental killers are floods ...
Lights, flashing
A sensation of flashing lights is created when the vitreous (the clear, jelly-like substance that fills the middle of the eye) shrinks and tugs on the retina. These flashes of ...
ligneous
Woody; having a woody feeling. [L. ligneus, wooden, fr. lignum, wood]
lignin
A random polymer of coniferyl alcohol accompanying cellulose and present in vegetable fiber and wood cells; a source of vanillin (by oxidation of l.); l. composition varies with ...
lignoceric acid
An acid present in one type of sphingolipid and in small amounts in triacylglycerols. SYN: n-tetracosanoic acid.
likelihood
A statement of the chance that an unknown quantity in reality has a particular value based on the readiness with which it would account for a given set of data; in this way the ...
Likert
Rensis, U.S. social psychologist, *1903. See L. scale.
Lillie
Ralph D., U.S. pathologist, 1896–1979. See Glenner-L. stain for pituitary. See entries under stain.
Lilly
John C., U.S. physiologist, *1915. See Silverman-L. pneumotachograph.
limb
1. An extremity; a member; an arm or leg. SYN: member. 2. A segment of any jointed structure. SEE ALSO: leg, crus. [A.S. lim] - ampullary membranous limbs of semicircular ducts ...
limbic
1. Relating to a limbus. 2. Relating to the l. system.
limbus
The edge, border, or fringe of a part. [L. a border] - l. acetabuli [TA] SYN: acetabular margin. - l. alveolaris 1. SYN: alveolar arch of mandible. 2. SYN: alveolar arch of ...
lime
1. CaO; an alkaline earth oxide occurring in grayish white masses (quicklime); on exposure to the atmosphere it becomes converted into calcium hydrate and calcium carbonate ...
limen
1. Entrance; the external opening of a canal or space, such as l. insulae [TA]. 2. SYN: threshold. [L.] - difference l. a barely noticeable change in the intensity or frequency ...
limerence
Emotional excitement of being in love.
limes
A boundary, limit, or threshold. SEE ALSO: L doses, under dose. [L.]
Liminal
In neurolgy, at the threshold of perception to a sensory stimulus. In other words, just barely perceptible to the senses. "Liminal" comes from the Latin noun " limen" meaning " ...
liminometer
An instrument for measuring the strength of a stimulus which is barely sufficient to produce a reflex response. [L. limen, threshold, + G. metron, measure]
limit
A boundary or end. [L. limes, boundary] - critical l. the upper or lower boundary of a laboratory test result that indicates a life-threatening value. - elastic l. the greatest ...
Limnatis nilotica
The horse leech; a species of land-leech of southern Europe and northern Africa which may infest the nostrils or gullet and, attaching itself to the mucous membrane, may cause ...
limnemia
SYN: chronic malaria. [G. limne, marsh, + haima, blood]
limnemic
Suffering from chronic malaria.
limnology
Study of the physical, chemical, meteorologic, and biologic conditions in fresh water; a branch of ecology. [G. limne, pool, + logos, study]
limon
SYN: lemon. [L.]
limophthisis
Rarely used term for emaciation from lack of sufficient nourishment. [G. limos, hunger, + phthisis, wasting]
limp
A lame walk with a yielding step; asymmetrical gait. SEE ALSO: claudication.
LINAC
Acronym of linear accelerator.
lincomycin
An antibacterial substance, composed of substituted pyrrolidine and octapyranose moities, produced by Streptomyces lincolnensis; active against Gram-positive organisms; used ...
lincture, linctus
An electuary or a confection; originally a medicinal preparation taken by licking. [L. lingo, pp. linctus, to lick]
lindane
Used as a scabicide, pediculicide, and insecticide (10 times more toxic for houseflies than DDT).
Lindau
Arvid, Swedish pathologist, 1892–1958. See L. disease, L. tumor, von Hippel-L. syndrome.
Lindau-von Hippel syndrome
The cardinal features of what is more commonly called von Hippel-Lindau (VHL) syndrome are benign blood-vessel tumors that most typically affect the eye and the brain. The eye ...
Lindbergh
Charles A., U.S. aviator, 1902–1974. See Carrel-L. pump.
Lindner
Karl D., Austrian ophthalmologist, 1883–1961. See L. bodies, under body.
line
1. A mark, strip, or streak. In anatomy, a long, narrow mark, strip, or streak distinguished from the adjacent tissues by color, texture, or elevation. SEE ALSO: linea. 2. A ...
Line, central
A catheter (tube) that is passed through a vein to end up in the thoracic (chest) portion of the vena cava (the large vein returning blood to the heart) or in the right atrium of ...

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