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Lung, collapsed
Failure of full expansion of a once fully expanded lung. Medically called atelectasis. The word comes from the Greek “a-“ (without) “telos” (complete) + “rectasis” ...
Lungs
: The lungs are a pair of breathing organs located with the chest which remove carbon dioxide from and bring oxygen to the blood. There is a right and left lung.
lungworms
Nematodes that inhabit the air passages of animals, chiefly in the family Metastrongylidae (or Protostrongylidae). See Aelurostrongylus, Crenosoma vulpis, Metastrongylus, ...
lunula
1. [NA] The pale arched area at the proximal portion of the nail plate. 2. A small semilunar structure. [L. dim. of luna, moon] - azure l. of nails bluish nonblanching ...
lunule
1. [TA] SYN: l. of nail. 2. A small semilunar structure. - l. of nail the pale arched area at the proximal portion of the nail plate. SYN: arcus unguium, half-moon, lunula ...
lupinidine
SYN: sparteine.
lupinosis
SYN: lathyrism. [L. lupinus, lupine, fr. lupus, wolf]
lupoid
Resembling lupus. [L. lupus + G. eidos, resemblance]
lupulin
A sticky, yellowish, granular material consisting of entire multicellular glandular hairs (trichomes) from the fruit and bracts of the hop vine, Humulus lupulus; the essential ...
lupus
A term originally used to depict erosion (as if gnawed) of the skin, now used with modifying terms designating the various diseases listed below. [L. wolf] - chilblain l. 1. ...
LUQ
Abbreviation for the left upper quadrant (quarter). The LUQ of the abdomen contains the spleen. (By contrast, RUQ stands for the right upper quadrant, LLQ stands for the left ...
lura
The contracted termination of the infundibulum of the brain. [L. the mouth of a bottle]
lural
Pertaining to the lura.
Luschka
Hubert, German anatomist, 1820–1875. See L. bursa, L. cartilage, L. ducts, under duct, L. gland, L. cystic glands, under gland, L. joints, under joint, L. ligaments, under ...
Luschka, foramina of
Two openings from the fourth ventricle, one in a system of four communicating cavities called ventricles within the brain that are continuous with the central canal of the spinal ...
Luse
Sarah A., U.S. physician, 1918–1970. See L. bodies, under body.
lusitropic
Relating to lusitropy.
lusitropy
Relaxation functions of cardiac muscle and chambers.
lute
To seal or fasten with wax or cement. [L. lutum, mud]
lute
To seal or fasten with wax or cement. [L. lutum, mud]
luteal
Relating to the corpus luteum; l. cells, l. hormone, etc. SYN: luteus. [L. luteus, saffron-yellow]
lutecium
SYN: lutetium.
lutein
1. The yellow pigment in the corpus luteum, in the yolk of eggs, or any lipochrome. 2. SYN: xanthophyll. 3. The dried powdered corpora lutea of the hog, formerly used as a ...
luteinization
Transformation of the mature ovarian follicle and its theca interna into a corpus luteum after ovulation; formation of luteal tissue, which appears yellow in some species.
luteinize
To form luteal tissue.
Luteinizing hormone
A hormone released by the pituitary gland in response to luteinizing hormone- releasing hormone. Abbreviated LH, it controls the length and sequence of the female menstrual ...
Luteinizing hormone-releasing hormone
: A hormone that controls sex hormones in men and women. Also called LHRH.
luteinoma
SYN: luteoma.
Lutembacher
René, French cardiologist, 1887–1916. See L. syndrome.
luteogenic
Luteinizing; inducing the production or growth of corpora lutea.
luteohormone
SYN: progesterone.
luteol, luteole
SYN: xanthophyll.
luteolin
The aglycon of galuteolin and cynaroside. SYN: cyanidenon.
luteolysin
Any agent, natural or compounded, that destroys the function of the corpus luteum. [L. luteus, saffron-yellow, + G. lysis, dissolution]
luteolysis
Degeneration or destruction of ovarian luteinized tissue.
luteolytic
Promoting or characteristic of luteolysis.
luteoma
An ovarian tumor of granulosa or theca-lutein cell origin, producing progesterone effects on the uterine mucosa. SYN: luteinoma. - pregnancy l. a benign lutein cell tumor of ...
luteotropic, luteotrophic
Having a stimulating action on the development and function of the corpus luteum.
lutetium
A rare earth element; atomic no. 71, atomic wt. 174.967. SYN: lutecium. [L. Lutetia, Paris]
luteus
SYN: luteal. [L.]
Lutheran Blood Group, Lu Blood Group
See Blood Groups Appendix.
lutropin
One of two glycoprotein hormones that stimulate the final ripening of the follicles and the secretion of progesterone by them, their rupture to release the egg, and the ...
lututrin
A water-soluble protein-like fraction extracted from the corpus luteum of sows' ovaries, resembling relaxin; it causes uterine relaxation and is used in dysmenorrhea.
Lutz
Alfredo, Brazilian physician, 1855–1940. See L.-Splendore- Almeida disease.
Lutzomyia
A genus of New World sandflies or bloodsucking midges (family Psychodidae) that serve as vectors of leishmaniasis and Oroyo fever; formerly combined with the Old World sandfly ...
lux
A unit of light or illumination; the reception of a luminous flux of 1 lumen per square meter of surface. SYN: candle-meter, meter-candle. [L. light]
luxatio
See luxation. [L. luxo, pp. -atus, to dislocate] - l. erecta subglenoid dislocation of the head of the humerus in which the arm is raised and abducted and cannot be lowered. - ...
Luxation
Complete dislocation of a joint. A partial dislocation is a subluxation. * * * 1. SYN: dislocation. 2. In dentistry, the dislocation or displacement of the condyle in the ...
Luxol fast blue
Name for a group of closely related copper phthalocyanin dyes used as stains (with PAS, PTAH, hematoxylin, silver nitrate, etc.) for myelin in nerve fibers.
luxus
Excess of any sort. [L. extravagance, luxury]
Luys
Jules Bernard, French physician, 1828–1897. See L. body, centre médian de L., corpus luysi, nucleus of L..
LVET
Abbreviation for left ventricular ejection time.
Lw
Former symbol for lawrencium.
lx
Abbreviation for lux.
lyase
Class name for those enzymes removing groups nonhydrolytically (EC class 4); prefixes such as “hydro-” and “ammonia-” are used to indicate the type of reaction. Trivial ...
Lycanthropy
The delusion that one has become a wolf or the werewolf transformation. Werewolf myths were associated with the phases of the moon. The werewolf was thought to take over when ...
lycoctonine
An alkaloid, C25H41NO7, obtained from Aconitum lycoctonum, an exceedingly poisonous species of aconite; it also occurs in other species of Aconitum and Delphinium.
lycopene
Ψ,Ψ-Carotene; the characteristic red pigment of the tomato that may be considered chemically as the parent substance from which all natural carotenoid pigments are derived; an ...
lycopenemia
A condition in which there is a high concentration of lycopene in the blood, producing carotenoidlike yellowish pigmentation of the skin; found in people who consume excessive ...
Lycoperdon
A genus of fungi (family Lycoperdaceae), some species of which have been used medicinally, e.g., in folk medicine, by nasal inhalation to treat epistaxis. The spores of L. ...
lycoperdonosis
A persisting pneumonitis following inhalation of spores of the puffballs Lycoperdon pyriforme and L. bovista.
lycophora
The 10-hooked larva of primitive tapeworms of the subclass Cestodaria.
lycopodium
The spores of L. clavatum (family Lycopodiaceae) and other species of L.; a yellow, tasteless, and odorless powder; was used as a dusting powder and in pharmacy to prevent the ...
lye
The liquid obtained by leaching wood ashes. See potassium hydroxide, sodium hydroxide. SYN: lixivium. [A.S. leáh]
Lyell
Aian. See L. disease, L. syndrome.
Lyme disease
Lyme disease is a bacterial illness caused by a bacterium called a " spirochete." Lyme disease is spread by ticks when they bite the skin. Lyme disease can cause abnormalities in ...
Lymnaea
A genus of snails, species of which are invertebrate hosts for the liver or sheep liver fluke, Fasciola hepatica, and other trematodes. [G. limne, marsh]
Lymph
: An almost colorless fluid that travels through vessels called lymphatics in the lymphatic system and carries cells that help fight infection and disease. * * * A clear, ...
lymph node
One of numerous round, oval, or bean-shaped bodies located along the course of lymphatic vessels, varying greatly in size (1–25 mm in diameter) and usually presenting a ...
Lymph node, sentinel
The first lymph node ("gland") to receive lymphatic drainage from a tumor. Which lymph node is the sentinel node for a given tumor is determined by injecting around the tumor a ...
lymph-
See lympho-.
lympha
SYN: lymph. [L.]
lymphaden
SYN: lymph node. [ lymph- + G. aden, gland]
lymphaden-
See lymphadeno-.
lymphadenectomy
Excision of lymph node s. [lymphadeno- + G. ektome, excision]
lymphadenitis
Inflammation of a lymph node or lymph node s. [lymphadeno- + G. -itis, inflammation] - dermatopathic l. SYN: dermatopathic lymphadenopathy. - mesenteric l. SYN: mesenteric ...
Lymphadenitis, regional
Cat scratch disease, a mild flu-like infection, with swollen lymph nodes (lymphadenitis) and mild fever of short duration, due to cat scratches, especially from kittens. There is ...
lymphadeno-, lymphaden-
The lymph node s. [L. lympha, spring water, + G. aden, gland]
lymphadenography
Radiographic visualization of lymph node s after injection of a contrast medium; lymphography. [lymphadeno- + G. grapho, to write]
lymphadenoid
Relating to, or resembling, or derived from a lymph node. [lymphadeno- + G. eidos, resemblance]
lymphadenoma
Obsolete term for: 1. An enlarged lymph node. 2. SYN: Hodgkin disease. [lymphadeno- + G. -oma, tumor]
Lymphadenopathy
Abnormally enlarged lymph nodes. Commonly called "swollen glands." The term "lymphadenopathy" is not as tough as it looks. It is made up of three words: lymph + adeno- (meaning ...
Lymphadenopathy-associated virus
Another name for the human immunodeficiency virus (HIV) that causes AIDS. Please see: Lymphadenopathy virus.
lymphadenosis
The basic underlying proliferative process that results in enlargement of lymph node s, as in lymphocytic leukemia and certain inflammations. [lymphadeno- + G. -osis, ...
lymphadenovarix
Varicose deformity of a lymph node associated with lymphangiectasis. [lymphadeno- + L. varix]
lymphagogue
An agent that increases the formation and flow of lymph. [lymph + G. agogos, drawing forth]
lymphangeitis
SYN: lymphangitis.
lymphangi-
See lymphangio-.
lymphangial
Relating to a lymphatic vessel.
lymphangiectasis, lymphangiectasia
Dilation of the lymphatic vessels, the basic process that may result in the formation of a lymphangioma. SYN: lymphectasia, telangiectasia lymphatica. [lymphangio- + G. ...
lymphangiectatic
Relating to or characterized by lymphangiectasis.
lymphangiectomy
Excision of a lymph channel. [lymphangio- + G. ektome, excision]
lymphangiitis
SYN: lymphangitis.
lymphangio-, lymphangi-
The lymphatic vessels. [L. lympha, spring water, + G. angeion, vessel]
lymphangioendothelioma
Old term for combined lymphatico-venous malformation. [lymphangio- + endothelium + -oma, tumor]
Lymphangiogram
: X-rays of the lymphatic system. A dye is injected to outline the lymphatic vessels and organs.
lymphangiography
Radiographic demonstration of lymphatics and lymph node s following the injection of a contrast medium; lymphography. [lymphangio- + G. grapho, to write]
lymphangioleiomyomatosis
A rare disorder of unknown etiology seen in women of reproductive age and in patients of either sex with tuberous sclerosis. Pulmonary complications are due to hamartomatous ...
lymphangiology
The branch of medical science concerned with the lymphatic vessels. SYN: lymphology. [lymphangio- + G. logos, study]
Lymphangioma
A structure consisting of a collection of blood vessels and lymph vessels that are overgrown and clumped together. Depending on their nature, these structures may grow slowly or ...
lymphangiomatous
Pertaining to, characterized by, or containing lymphangioma.
lymphangiomyomatosis
SYN: lymphangioleiomyomatosis. [lymphangio- + myoma + -osis, condition]
lymphangion
A lymphatic vessel. See lymph vessels, under vessel. [L. lympha, lymph, + G. angeion, vessel]
lymphangiophlebitis
Inflammation of the lymphatic vessels and veins.
lymphangioplasty
Surgical alteration of lymphatic vessels. [lymphangio- + G. plastos, formed]
lymphangiosarcoma
A malignant neoplasm derived from vascular tissue, i.e., an angiosarcoma, in which the neoplastic cells originate from the endothelial cells of lymphatic vessels, usually ...
lymphangiotomy
Incision of lymphatic vessels. [lymphangio- + G. tome, incision]
lymphangitis
Inflammation of the lymphatic vessels. SYN: lymphangeitis, lymphangiitis. [lymphangio- + G. -itis, inflammation] - l. carcinomatosa extensive lymphatic permeation by tumor ...
lymphapheresis
SYN: lymphocytapheresis.
lymphatic
1. Pertaining to lymph. 2. A vascular channel that transports lymph. 3. Sometimes used to pertain to a sluggish or phlegmatic characteristic. SYN: vas lymphaticum. [L. ...
Lymphatic filariasis
A parasitic disease caused by the African eye worm, a microscopic thread-like worm. The adult worms can only live in the human lymph system. Lymphatic filariasis affects over 120 ...
Lymphatic system
: The tissues and organs, including the bone marrow, spleen, thymus, and lymph nodes, that produce and store cells that fight infection and disease. The channels that carry lymph ...
Lymphatic tissue
A part of the body's immune system that helps protect it from bacteria and other foreign entities. Lymphatic tissue is rich in lymphocytes (and accessory cells such as macrophages ...
lymphaticostomy
Making an opening into a lymphatic duct. [lymphatic + G. stoma, mouth]
Lymphatics
Lymphatics are small thin channels similar to blood vessels. They do not carry blood, but collect and carry tissue fluid from the body to ultimately drain back into the blood ...
lymphatitis
Obsolete term for inflammation of the lymphatic vessels or lymph node s. [lymphatic + G. -itis, inflammation]
lymphatology
The study of the lymphatic system. [lymphatic + G. logos, study]
lymphatolysis
Obsolete term for destruction of the lymphatic vessels or lymphoid tissue, or both. [lymphatic + G. lysis, dissolution]
lymphatolytic
Pertaining to or characterized by lymphatolysis.
lymphectasia
SYN: lymphangiectasis. [lymph + G. ektasis, a stretching]
Lymphedema
A common chronic, debilitating condition in which excess fluid called lymph collects in tissues and causes swelling (edema) in them. Lymphedema (edema due to lymphatic fluid) may ...
lymphemia
The presence of unusually large numbers of lymphocytes or their precursors, or both, in the circulating blood. [lymph(ocyte) + G. haima, blood]
lymphization
The formation of lymph.
lympho-, lymph-
Lymph. [L. lympha, spring water]
lymphoblast
A young immature cell that matures into a lymphocyte and is characterized by more abundant cytoplasm than in a lymphocyte, a nucleus in which the chromatin is finer than in a ...
lymphoblastic
Pertaining to the production of lymphocytes.
lymphoblastoma
SYN: lymphoblastic lymphoma. [ lymphoblast + G. -oma, tumor] - giant follicular l. SYN: nodular lymphoma.
lymphoblastosis
The presence of lymphoblasts in the peripheral blood; sometimes used as a synonym for acute lymphocytic leukemia. [ lymphoblast + G. -osis, condition]
lymphocele
A cystic mass that contains lymph, usually from diseased or injured lymphatic channels. SYN: lymphocyst. [lympho- + G. kele, tumor]
lymphocerastism
Obsolete term for the process of formation of cells in the lymphocytic series. [lympho- + G. kerastos, mixed, mingled]
lymphocinesis, lymphocinesia
SYN: lymphokinesis.
lymphocyst
SYN: lymphocele. [lympho- + G. kystis, bladder]
lymphocytapheresis
Separation and removal of lymphocytes from the withdrawn blood, with the remainder of the blood retransfused into the donor. SYN: lymphapheresis. [lymphocyte + G. aphairesis, a ...
lymphocyte
A white blood cell formed in lymphatic tissue throughout the body ( e.g., lymph node s, spleen, thymus, tonsils, Peyer patches, and sometimes in bone marrow) and in normal ...
lymphocythemia
SYN: lymphocytosis.
Lymphocytic
: Referring to lymphocytes, a type of white blood cell. * * * Pertaining to or characterized by lymphocytes.
Lymphocytic leukemia, acute (ALL)
A rapidly progressing form of leukemia in which there are too many very young (immature) white blood cells called lymphoblasts in the bloodstream and bone marrow.
lymphocytoblast
SYN: lymphoblast. [lymphocyte + G. blastos, germ]
lymphocytoma
A circumscribed nodule or mass of mature lymphocytes, grossly resembling a neoplasm. [lymphocyte + G. -oma, tumor] - benign l. cutis a soft red to violaceous skin nodule often ...
lymphocytopenia
SYN: lymphopenia.
lymphocytopoiesis
The formation of lymphocytes. [lymphocyte + G. poiesis, a making]
Lymphocytosis
Too many lymphocytes, a finding that may be a marker for infection or disease. * * * A form of actual or relative leukocytosis in which there is an increase in the number of ...
lymphoderma
A condition resulting from any disease of the cutaneous lymphatic vessels. [lympho- + G. derma, skin]
lymphoduct
A lymphatic vessel. See lymph vessels, under vessel. [lympho- + L. ductus, a leading]
lymphogenesis
Lymph production. [lympho- + G. genesis, production]
lymphogenic
SYN: lymphogenous (1).
lymphogenous
1. Originating from lymph or the lymphatic system. SYN: lymphogenic. 2. Producing lymph.
lymphoglandula
SYN: lymph node.
lymphogranuloma
Old nonspecific term used with reference to a few basically dissimilar diseases in which the pathologic processes result in granulomas or granulomalike lesions, especially in ...
lymphogranulomatosis
Any condition characterized by the occurrence of multiple and widely distributed lymphogranulomas.
lymphography
Visualization of lymphatics ( lymphangiography) and lymph node s ( lymphadenography) by radiography following the intralymphatic injection of a contrast medium, usually an ...
lymphohistiocytosis
Proliferation or infiltration of lymphocytes and histiocytes. - familial erythrophagocytic l. (FEL) SYN: familial hemophagocytic l.. - familial hemophagocytic l. ( FMLH) an ...
Lymphoid
: Referring to lymphocytes, a type of white blood cell. Also refers to tissue in which lymphocytes develop. * * * Resembling lymph or lymphatic tissue, or pertaining to the ...
Lymphoid tissue
A part of the body's immune system that helps protect it from bacteria and other foreign entities. Lymphoid tissue is rich in lymphocytes (and accessory cells such as macrophages ...
lymphoidectomy
Excision of lymphoid tissue. [lymphoid + G. ektome, excision]
lymphoidocyte
A primitive mesenchymal cell believed to be capable of differentiating into all types of lymphoid cells, including lymphocytes, littoral cells, and reticular cells of lymph node ...
lymphokine
Hormonelike peptide, released by activated lymphocytes, that mediates immune response; a cytokine obtained from lymphocytes. [lymphocyte + G. kineo, to set in motion]
lymphokinesis
1. Circulation of lymph in the lymphatic vessels and through the lymph node s. 2. Movement of endolymph in the semicircular canals of the inner ear. SYN: lymphocinesis, ...
lympholeukocyte
SYN: lymphocyte.
lymphology
SYN: lymphangiology. [lympho- + G. logos, study]
Lymphoma
Tumor of the lymphoid tissue. Diagnosis is by biopsy. Treatment may be chemotherapy, radiation, surgery, or medication, depending on the age of the patient and type of tumor. * * ...
Lymphoma, AIDS-related
Lymphoid tumors that appear in people with AIDS, presumably due to immune- system impairment. Treatment is like that of other lymphomas, but must take impaired natural immunity ...
Lymphoma, lymphoblastic
A rapidly moving, aggressive form of lymphoma most often seen in children or young adults. Treatment may be chemotherapy, radiation, surgery, medication, and/or bone-marrow ...
Lymphoma, non-Hodgkin
Malignant tumors that arise in the lymphatic system. There are several subtypes of cancer classified as non-Hodgkin lymphoma. All originate in and spread via the lymphatic ...
lymphomatoid
Resembling a lymphoma.
lymphomatosis
Any condition characterized by the occurrence of multiple, widely distributed sites of involvement with lymphoma.
lymphomatous
Pertaining to or characterized by lymphoma.
lymphonodus
lymph node.
lymphopathia
SYN: lymphopathy.
lymphopathy
Any disease of the lymphatic vessels or lymph node s. SYN: lymphopathia. [lympho- + G. pathos, suffering]
lymphopenia
A reduction, relative or absolute, in the number of lymphocytes in the circulating blood. SYN: lymphocytic leukopenia, lymphocytopenia. [lympho- + G. penia, poverty]
lymphoplasmapheresis
Separation and removal of lymphocytes and plasma from the withdrawn blood, with the remainder of the blood retransfused into the donor. [lymphocyte + plasma + G. aphairesis, a ...
lymphopoiesis
The formation of lymphatic tissue. [lympho- + G. poiesis, a making]
lymphopoietic
Pertaining to or characterized by lymphopoiesis.
Lymphoproliferative disorders
Malignant diseases of the lymphoid cells and cells from the reticuloendothelial system (which take up and sequester inert particles). The lymphoproliferative disorders are in ...
lymphoreticulosis
Proliferation of the reticuloendothelial cells (macrophages) of the lymph node s. - benign inoculation l. SYN: catscratch disease.
Lymphoreticulosis, benign
Cat scratch disease, a mild flu-like infection, with swollen lymph nodes (lymphadenitis) and mild fever of short duration, due to cat scratches, especially from kittens. There is ...
lymphorrhagia
SYN: lymphorrhea. [lympho- + G. rhegnymi, to burst forth]
lymphorrhea
An escape of lymph onto the surface of the skin from ruptured, torn, or cut lymphatic vessels. SYN: lymphorrhagia. [lympho- + G. rhoia, a flow]
lymphorrhoid
A dilation of a lymph channel, resembling a hemorrhoid. [lymph + -rrhoid, tending to leak, on the analogy of hemorrhoid]
lymphoscintigraphy
Scintillation scanning of lymphatics or lymph node s following intralymphatic or subcutaneous injection of a radionuclide.
lymphosis
Obsolete term for lymphocytic leukemia.
lymphostasis
Obstruction of the normal flow of lymph. [lympho- + G. stasis, a standing still]
lymphotaxis
The exertion of an effect that attracts or repels lymphocytes. [lympho- + G. taxis, orderly arrangement]
lymphotoxicity
Toxicity to lymphocytes.
lymphotoxin
A lymphokine from T lymphocytes that lyses or damages many cell types.
lymphotrophy
Nourishment of the tissues by lymph in parts devoid of blood vessel s. [lympho- + G. trophe, nourishment]
lymphuria
Discharge of lymph in the urine. [lympho- + G. ouron, urine]
Lynch
Henry T., 20th century U.S. oncologist. See L. syndrome.
lynestrenol
A progestational agent, used with mestranol as an oral contraceptive. SYN: ethinylestrenol.
lyo-
Dissolution. SEE ALSO: lyso-. [G. lyo, to loosen, dissolve]
lyoenzyme
1. Any enzyme existing in the cell in soluble form. 2. A soluble enzyme.
lyolysis
Rarely used term for solvolysis.
Lyon
B. B. Vincent, U.S. physician, 1880–1953. See Meltzer-L. test. Mary F., English cytogeneticist, *1925. See L. hypothesis, lyonization.
Lyonization
The inactivation of an X chromosome. One of the two X chromosomes in every cell in a female is randomly inactivated early in embryonic development. Named after geneticist Mary ...
lyophil, lyophile
A substance that is lyophilic.
lyophilic
1. In colloid chemistry, denoting a dispersed phase having a pronounced affinity for the dispersion medium; when the dispersed phase is l., the colloid is usually a reversible ...
lyophilization
1. The process of isolating a solid substance from solution by freezing the solution and evaporating the ice under vacuum. 2. The process of imparting lyophilic properties to ...
lyophobe
A substance that is lyophobic.
lyophobic
1. In colloid chemistry, denoting a dispersed phase having but slight affinity for the dispersion medium; when the dispersed phase is l., the colloid is usually an ...
lyosorption
Adsorption of a liquid on a solid surface.
lyotropic
SYN: lyophilic. [ lyo- + G. trope, a turning]
lypressin
Vasopressin-containing lysine in position 8; an antidiuretic and vasopressor hormone. SYN: 8-lysine vasopressin.
lyra
A lyre-shaped structure. [L. and G. lyre] - l. davidis, lyre of David obsolete terms for commissura fornicis. - l. uterina SYN: palmate folds of cervical canal, under fold.
Lys
Symbol for lysine or lysyl.
lys-
See lyso-.
lysate
Material produced by the destructive process of lysis.
lyse
To break up, to disintegrate, to effect lysis. SYN: lyze.
lysemia
Disintegration or dissolution of red blood cells and the occurrence of hemoglobin in the circulating plasma and in the urine. [lyso- + G. haima, blood]
Lysenkoism
A theory put forth by a Russian plant-breeder named Trofim Denisovich Lysenko [1898-1976] during the Lenin/Stalin years that served to stifle the progress of genetics in the ...
lysergamide
SYN: lysergic acid amide.
lysergic acid
The d-isomer is a cleavage product of alkaline hydrolysis of ergot alkaloids; occurs as shiny crystals, slightly soluble in water; a psychotomimetic. - l. amide a ...
lysergide
SYN: lysergic acid diethylamide.
lysergol
A semisynthetic ergot alkaloid.
lysin
1. A specific complement-fixing antibody that acts destructively on cells and tissues; the various types are designated in accordance with the form of antigen that stimulates the ...
lysine
2,6-Diaminohexanoic acid; the l-isomer is a nutritionally essential α-amino acid of mammals found in many proteins; distinguished by an ε-amino group. - l. decarboxylase an ...
lysinemia
See hyperlysinemia.
lysinium
The cation form of lysine, either l. (+1) or l. (+2).
lysinogen
An antigen that stimulates the formation of a specific lysin.
lysinogenic
Having the property of a lysinogen.
lysinuria
The presence of lysine in the urine.
Lysis
Destruction. Hemolysis (hemo-lysis) is the destruction of red blood cells with the release of hemoglobin; bacteriolysis (bacterio-lysis) is the destruction of bacteria; etc. ...
lyso-, lys-
Lysis, dissolution. SEE ALSO: lyo-. [G. lysis, a loosening]
lysocephalin
A lysophosphatidic acid esterified with serine or ethanolamine, i.e., a lysophosphatidylserine or -ethanolamine; analogous to lysolecithin.
lysogen
1. That which is capable of inducing lysis. 2. A bacterium in the state of lysogeny. 3. Any antigen that stimulates lysin production. [lysin + G. -gen, producing]
lysogenesis
The production of lysins.
lysogenic
1. Causing or having the power to cause lysis, as the action of certain antibodies and chemical substances. 2. Pertaining to bacteria in the state of lysogeny.
lysogenicity
The property of being lysogenic.
lysogenization
The process by which a bacterium becomes lysogenic.
lysogeny
The phenomenon by which a bacterium is infected by a temperate bacteriophage whose DNA is integrated into the bacterial genome and replicates along with the bacterial DNA but ...
lysokinase
Term for activator agents ( e.g., streptokinase, urokinase, staphylokinase) that produce plasmin by indirect or multiple-stage action on plasminogen.
lysolecithin
A lysophosphatidylcholine; capable of lysing erythrocytes. - l.-lecithin acyltransferase (LLAT) an enzyme that catalyzes the reversible reaction of l. and another phospholipid ( ...
lysolecithinase
SYN: lysophospholipase.
lysophosphatidic acid
A phosphatidic acid in which only one of the two hydroxyl groups of the glycerophosphate is esterified; most commonly, when carbon-1 of the glycerol moiety is esterified ( e.g., ...
lysophosphatidylcholine
A phosphatidylcholine in which a fatty acid has been removed from the C2 position of the glycerol group.
lysophosphatidylserine
Phosphatidylserine from which one fatty acid residue has been removed from the glycerol moiety, typically at carbon-2. Cf.:lysophosphatidic acid.
lysophospholipase
A hydrolase removing the single acyl group from a lysolecithin, producing glycerophosphocholine and the free fatty acid anion. SYN: lecithinase B, lysolecithinase, ...
Lysosomal enzyme
An enzyme in an organelle (a little organ) called the lysosome within the cell. Lysosomal enzymes degrade (break down) macromolecules (large molecules) and other materials (such ...
Lysosome
An organelle (a little organ) within a cell containing enzymes that degrade macromolecules (large molecules) and other materials (such as bacteria) taken up by a cell during the ...
lysostaphin
A peptidase enzyme produced by certain strains of staphylococcus microorganisms with antibacterial activity against staphylococci.
lysotype
A type within a bacterial species determined by its reaction to specific phages. [lyso + type]
lysozyme
An enzyme hydrolyzing 1,4-β links between N-acetylmuramic acid and N-acetyl-d-glucosamine, and thus destructive to cell walls of certain bacteria; present in tears and some other ...
Lyssavirus
A genus of viruses (family Rhabdoviridae) that includes the rabies virus group. - Australian bat L. a species that has caused a fatal rabieslike disease in a woman in ...
lysyl
The univalent radical of lysine. - l. hydroxylase an enzyme that acts on specific l. residues in certain proteins ( E.G., collagens) with α-ketoglutarate and O2 to produce ...
lysyl-bradykinin
SYN: kallidin.
Lythoglyphopsis
A genus of amphibious freshwater operculate snails of the family Hydrobiidae ( subfamily Hydrobiinae; subclass Prosobranchiata). In the Mekong River delta, L. aperta serves as ...
Lytic
Suffix having to do with lysis. For example, hemolytic anemia. * * * Pertaining to lysis; used colloq. as an abbreviation for osteolytic.
lyxitol
A pentitol (reduced lyxose) occurring in lyxoflavin.
lyxoflavin
A compound similar to riboflavin except that d-lyxitol is present in place of the d-ribitol group; present in small quantity in cardiac muscle.
lyxose
An aldopentose; d-l. is epimeric with both d-arabinose and d-xylose; l-l. is epimeric with d-ribose.
lyxulose
The 2-keto derivative of lyxose.
lyze
SYN: lyse.
M
1. Symbol for mega- (2); morgan; molarity (moles per liter, also written M or m); myopia or myopic; methionine; 6-mercaptopurine ribonucleoside in a nucleic acid; L. ...
m
Symbol for molarity. Symbol for meter; milli-; minim; mass; magnetic dipole moment; molality. Symbol for moles per liter (also written M or M).
M'Dowel
Benjamin G., Irish anatomist, 1829–1885. See frenulum of M..
M'Naghten
Daniel, British criminal, tried in March, 1843. See M. rule.
m-
Abbreviation for meta- (2).
m-chloral
A polymer of chloral obtained by prolonged contact with sulfuric acid; it has properties similar to those of chloral hydrate. SYN: metachloral, p-chloral, trichloral.
m-cone
Middle wavelength sensitive cone (green cone).
m-cresol
A local antiseptic with a higher germicidal power than phenol and less toxicity to tissues; used in disinfectants and fumigants; its acetate derivative is used as a topical ...
M-CSF
Abbreviation for macrophage colony-stimulating factor.
M-mode
A diagnostic ultrasound presentation of the temporal changes in echoes in which the depth of echo-producing interfaces is displayed along one axis with time (T) along the second ...
M.
Abbreviation for L. misce, mix.
m. dict.
Abbreviation for [L] more dicto, as directed.
M.C.
Abbreviation for Magister Chirurgiae, Master of Surgery; Medical Corps.

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