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Medical Dictionary Terms Beginning with L
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Legg-Perthes disease
Legg-Perthes disease: A hip disorder in children due to interruption of the blood supply to the head of the femur (the ball in the ball-and-socket hip joint). Also called Legg disease and Legg-Calve-Perthes disease.more detail info...
Legionaire's disease
Legionaire's disease: A disease (first identified at the 1976 American Legion convention) due to bacteria (Legionella) found in plumbing, shower heads and water- storage tanks. Outbreaks of Legionella pneumonia have been attributed to evaporative cmore detail info...
Legionella
Legionella: The bacteria causing Legionaire's disease.more detail info...
Leiomyoma
Leiomyoma: A benign tumor of smooth muscle, the type of muscle found in the heart and uterus. A leiomyoma of the uterus is commonly called a fibroid.more detail info...
Leiomyosarcoma
Leiomyosarcoma: a malignant tumor of smooth muscle origin. Smooth muscle is the major structural component of most hollow internal organs and the walls of blood vessels. Can occur almost anywhere in the body but is most frequent in the uterus and gastrmore detail info...
Leishmania
Leishmania: A group of parasites causing considerable human disease (leishmaniasis).more detail info...
Leishmaniasis
Leishmaniasis: Diseases due to Leishmania involving the organs (kala-azar), skin plus mucous membranes (espundia), or skin alone (usually named for the place plus boil, button or sore as, for example, Jericho boil, Bagdad button, Dehli sore).more detail info...
Lennox syndrome
Lennox syndrome: See Lennox-Gastaut syndrome.more detail info...
Lennox-Gastaut syndrome
Lennox-Gastaut syndrome: A severe form of epilepsy that usually begins in early childhood and is characterized by frequent seizures of multiple types, mental impairment, and a particular brain wave pattern (a slow spike-and-wave pattern). The seizuresmore detail info...
Lens
Lens: The transparent structure inside the eye that focuses light rays onto the retina (the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain). The lens was named after the lmore detail info...
Lens, intraocular
Lens, intraocular: The clouded (cataractous) lens is best removed in its entirety by surgery and replaced with an intraocular lens (IOL) made of plastic, an operation that takes about an hour and usually does not need hospitalization. Cataract sumore detail info...
Lens, objective
Lens, objective: In a microscope, the objective lens is the lens nearest to the object being examined whereas the lens closest to the eye is termed the ocular (the eyepiece). The light microscope today is usually binocular (with one ocular for each eye)more detail info...
Lens, ocular
Lens, ocular: In a microscope, the lens closest to the eye is termed the ocular (the eyepiece) whereas the objective (also called the objective lens) is the lens nearest to the object being examined. The light microscope today is usually binocular (withmore detail info...
Leonardo da Vinci
Leonardo da Vinci: Architect, engineer, inventor, painter and the father of anatomic art. Leonardo da Vinci first became interested when he was asked by a Veronese anatomist named Marc Antonia Della Torre to do the illustrations for a text of anmore detail info...
Leprosy
Leprosy: A skin infection caused by a bacteria, which can also be associated with nerve damage. The bacteria involved is called Mycobacterium leprae.more detail info...
Lesbian
Lesbian: Female homosexual. The name &lesbian& comes from the Greek island of Lesbos in the Aegian Sea where in antiquity the women were said to be homosexual. The poet Sappho who lived on Lesbos (circa 600 BC) was a lesbian in both geographimore detail info...
Lesbianism
Lesbianism: Female homosexuality. Also called sapphism (after the lesbian poet Sappho).more detail info...
Lesion
Lesion: An area of abnormal tissue change.more detail info...
Let down reflex
Let down reflex: An involuntary reflex during breastfeeding which causes the milk to flow freely.more detail info...
Lethal
Lethal: Deadly.more detail info...