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Medical Dictionary: l

L&Dlabor and delivery reproductive
L&Rleft & rightdirectional
labi/olips, labiadigestive
labialPertaining to the lips.Integumentary
labial mucosaThe inner lining of the lips.digestive
-labileunstable, subject to changegeneral
laborThe childbirth process of expulsion of the fetus and placenta from the uterus.Reproductive
labrumA lip.Integumentary
labyrinthA complex system of ducts and cavities that comprise the organs of hearing and balance.Eyes And Ears
labyrinth/oinner eareyes and ears
labyrinthectomyAn ear operation used for Meniere's syndrome.eyes and ears
labyrinthitisInflammation of the inner ear (labyrinth). Eyes And Ears
lacerationA wound, specifically a deep tear or cut of the flesh.general
lacrim/otearseyes and ears
lacrimationCrying.Eyes And Ears
lactaseAn enzyme secreted by the small intestine glands that convert lactose into glucose and galactose.Digestive
lactationProduction of milk by the mammary glands.Reproductive
lactic acidA organic acid produced by anaerobic respiration, by fermentation of carbohydrates in the rumen and by bacterial action on milk.Digestive
lactoseThe main sugar of milk consisting of one molecule each of glucose and galactose.Digestive
lacunaA small cavity or depression.Skeletal
LADleft anterior decendingCardiovascular
lamellaA thin scale or plate, as of bone.General
lamin/olamina (part of the vertebral arch that forms the roof of the spinal canal)skeletal
laminectomyA surgical procedure to remove a portion of the vertebral bone called the lamina.skeletal
lancetA two-edged surgical knife with a sharp point.General
lanolinWool fat that is refined and used as an emollient, cosmetic, and pharmaceutic aid. General
lapar/oabdominal walldigestive
laparoscopeAn endoscope for examining the abdominal and pelvic organs in the peritoneal cavity. General
laparoscopySurgery using a thin light tube inserted into a small incision. endocrine
laparotomyIncision into the side of the abdomen between the ribs and pelvis. General
larvaWormlike developmental stage in the life cycle of insects, worms, and other metamorphosing animals. General
laryngectomyPartial or total removal of the larynx. Respiratory
laryngitisInflammation of the larynx, including the vocal cords. Characterized by voice disorders, usually viral etiology.Respiratory
laryngomalaciaAn abnormally underdeveloped or degenerated cartilage in the larynx. Respiratory
laryngoplastyPlastic repair of the larynx.Respiratory
laryngoscopyVisual examination of the larynx. May also include treatment. Respiratory
larynxThe voice box. Includes the vocal cords and surrounding cartilage. Respiratory
laser trabeculoplastyUsing a very focused beam of light to treat the drainage angle of the eye. eyes and ears
latlateral Directional
lateralAway from the body's midlinedirectional
lavageWashing out a body cavity with water or medicated solution.General
laxativeAgents that produce a soft formed stool and relax the bowels, used to relieve constipation. Digestive
LBBBleft bundle branch blockcardiovascular
LBWlow birth weight reproductive
LDHlactate dehydrogenase general
LDLlow-density lipoprotein Cardiovascular
LElower extremityDirectional
lecith/oyolk, ovumreproductive
leechingThe application of leeches to the body to draw blood for therapeutic purposes.General
legThe inferior part of the lower extremity between the knee and the ankle. Common usage is the entire lower limb.Skeletal
legionnaires diseaseAn acute bacterial infection of the lungs characterized by high fever, malaise, muscle aches, respiratory disorders and headache.Respiratory
leiomy/osmooth (visceral) musclemuscular
leiomyomaA benign neoplasm derived from smooth muscle tissue, also known as a fibroid tumor. They usually occur in the uterus.Reproductive
leiomyosarcomaA malignant neoplasm derived from smooth muscle.General
leishmaniasis A group of infections, caused by the protozoan flagellate Leishmania. General
-lemmasheath, confining membranegeneral
lentigoA small, flat, pigmented spot on the skin.Integumentary
lepid/oflakes, scalesgeneral
leprosyChronic bacterial infection that affects peripheral nerves in the hands and feet, mucous membranes of the nose, throat and eyes and that causes skin lesions.General
lept-thin, slight, slendergeneral
leptinA hormone that regulates energy balance by helping control appetite.endocrine
lesionAny abnormal changes or damage to body tissues.general
lethargyA condition of tiredness, fatigue, or lack of energy.nervous
leukemiaCancer of the blood. The bone marrow then produces abnormal white blood cells which do not function properly.Cardiovascular
leukocyt/owhite blood celllymphatic
leukocyteA white blood cell.Cardiovascular
leukocytosisAn abnormally large increase in the number of leukocytes in the blood. Cardiovascular
leukoplakiaA white patch lesion found on a mucous membrane that cannot be scraped off.digestive
leukorrheaNormal vaginal discharge during pregnancy . It is thin, white, milky and mild smelling.reproductive
levocardiaCongenital abnormalities in which the heart is in the normal position in the left side of the chest but some or all of the thorax or abdomen viscera are transposed laterally. General
-lexiareading, wordgeneral
LFTliver function test digestive
LGIlower gastrointestinaldigestive
LHluteinizing hormone endocrine
Lilithium general
libidoSexual desire.Reproductive
lichenAny of various papular skin disease in which the lesions are typically small, firm papules set very close together.Integumentary
lidocaineA local anesthetic, analgesic and cardiac depressant.General
LIFleukemia inhibatory factorLymphatic
ligligament muscular
ligamentFlexible, tough bands of fibrous tissue connecting bones at a joint.Skeletal
lingualPertaining to or near the tongue.Digestive
linimentsHeat-generating liquids that are applied to the skin.Integumentary
lip/ofat, lipidintegumentary
lipedemaA chronic disease that occurs mostly in females. It is characterized by bilateral, symmetrical fatty tissue excess, mainly in the legs.integumentary
lipidOrganic compounds, including the fats, oils, waxes, sterols, and triglycerides, that are insoluble in water but soluble in nonpolar organic solvents.General
lipolysisThe metabolic process of breaking down of fat.Digestive
lipomaA noncancerous growth of fatty tissue cells. Occurs over area of past trauma.integumentary
lipomatosisA disorder characterized by abnormal tumor-like accumulations of fat in body tissues.General
liposarcomaA malignant neoplasm of fat cells that occurs in the retroperitoneal tissues and the thigh.General
liposuctionPlastic surgery that removes subcutaneous fat using a suction tube.General
-lipsisomit, failReproductive
liq.liquid; fluid
lith/ostone, calcificationurinary
lithiasisFormation of stones in an internal organ, such as in the gallbladder, kidney, and lower urinary tract. General
-lithiasispresence of stonesdigestive
-lithotomyincision for stone removalurinary
liverA large lobed glandular organ in the abdomen with a wide range of function including detoxification, metabolism, synthesis and storage of various substances. General
LLEleft lower extremity directional
LLLleft lower lobe directional
LLQleft lower quadrant directional
lmplast menstrual period reproductive
lobeA major division of an organ.General
LOClevel/loss of consciousness nervous
lochiaA vaginal discharge occurring during the first week or two after childbirth.Reproductive
locomotionMovement or the ability to move from one place or another.General
locusA place or site.General
-logspeech, words, thoughtgeneral
log-speech, wordsnervous
logad/owhites of the eyeseyes and ears
logo-words, speechnervous
-logystudy ofgeneral
loinThe part of the side and back between the lowest rib and the pelvis. General
longevityAn organism's life span.General
longitudinal studiesStudies in which variables relating to an individual or group of individuals are assessed over an extended span of time. General
loph/oridge, crested partgeneral
lord/ocurve, swaybackskeletal
lordosisAbnormal, concave curvature of the lower spine. Also called swayback. skeletal
loupeA magnifying lens.General
low density lipoproteinCholesterol that collects on blood vessel walls, increasing risk of heart problems.Cardiovascular
lox/ooblique, slantingSkeletal
lozengeA medicated candy.General
LPlumbar puncture nervous
LRlactated ringer (solution)
LRIlower respiratory infectionrespiratory
LRTlower respiratory tractrespiratory
lubricationThe use of an agent such as grease to diminish friction between two surfaces. General
-lucentlight admittinggeneral
LUEleft upper extremity directional
LULleft upper lobe directional
lumb/olower backskeletal
lumbagoMild to severe low back pain.skeletal
lumbarReferring to the lower back below the thoracic vertebrae and above the sacral vertebrae. Skeletal
lumenThe channel within a tube or tubular organ.General
lumin/olumen (channel within a tube)general
luminescenceEmission of light from a body as a result of a chemical reaction.General
lumpectomy Surgical excision of a tumor from the breast without removing large amounts of surrounding tissue.General
lungsA pair of organs that aerate the blood. The right lung is divided into three lobs while the left lung has two lobes.Respiratory
lupusAny of a group of inflammatory autoimmune disorders can affect the skin, joints and internal organs.Integumentary
LUQleft upper quadrant directional
luteinizing hormoneA hormone released by the pituitary gland. It stimulates the secretion of sex hormones by the ovary and the testes and is involved in the maturation of spermatozoa and ova.endocrine
luteomaAn ovarian neoplasm composed of luteal cells derived from luteinized granulosa cells and theca cells. General
LVleft ventricle cardiovascular
LVADleft ventricular assist device cardiovascular
LVHleft ventricular hypertrophy cardiovascular
lyme diseaseAn subacute inflammatory disorder caused by a spirochete, Borrelia burgdorferi, which is transmitted chiefly by ticks. It is characterized by fatigue, concentration difficulties or joint pain.General
lymphThe interstitial fluid that is in the lymphatic system. lymphatic
lymphaden/olymph nodelymphatic
lymphadenitisInflammation of the lymph nodes.lymphatic
lymphadenopathyInflammation of the lymph nodes causing enlargement.lymphatic
lymphangi/olymph vessellymphatic
lymphangiectasisA transient dilatation of the lymphatic vessels. Lymphatic
lymphangiomaA congenital malformation of the lymphatic system. lymphatic
lymphangiosarcomaA malignant neoplasm originating from the endothelial cells of lymphatic vessels. Lymphatic
lymphedemaEdema due to obstruction of lymph vessels or disorders of the lymph nodes. A common complication in the arms after mastectomy.lymphatic
lymphoceleCystic mass containing lymph.Lymphatic
lymphocytesWhite blood cells that help determine the body's immune response to infectious microorganisms.Cardiovascular
lymphocytosisAn abnormal increase in the number of lymphocytes in the blood. Lymphatic
lymphomaA cancer of the lymphatic system.lymphatic
lymphopeniaDecrease in the number of lymphocytes of the blood. Lymphatic
lymphuriaThe presence of lymph in urine.Urinary
lysineAn essential amino acid. Digestive
-lysisloosening, separatingskeletal
lyso-dissolution, loosengeneral

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