Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «L»:
Lassitude: Weakness, weariness, listlessness, exhaustion, lethargy. For example, the patient complained of lassitude. Borrowed from French, from Latin lassitudo, from lassus meaning weary....
Last menstrual period
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 periods are regular and ovulation occurs on day 14 of her cycle, conception takes place about 2 weeks after her LMP. A woman is therefore consid...
Late infantile neuroaxonal dystrophy
Late infantile neuroaxonal dystrophy: See: Hallervorden-Spatz disease....
Latent: Hidden, dormant, inactive.
The virus that causes chickenpox remains latent after the initial attack of chickenpox is over. When it becomes reactivated, usually many years later, the virus causes shingles.
HIV may remain in a small long-lived population of infected T cells. These cells prov...
Lateral: 1. In anatomy, the side of the body or a body part that is farther from the middle or center of the body. Typically,
lateral refers to the outer side of the body part, but it is also used to refer to the side of a body part. For example, when
referring to the knee, lateral refers to the si...
Lateral collateral ligament (LCL) of the knee
Lateral collateral ligament (LCL) of the 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 ligaments). These ligaments provide stability and strength to the knee joi...
Lateral epicondylitis: See: Tennis elbow....
Lateral meniscus of the knee
Lateral meniscus of the knee: The word "meniscus"
refers to a crescent-shaped structure. The lateral meniscus of the
knee is a thickened crescent-shaped cartilage pad between the two
joints formed by the femur (the thigh bone) and the tibia (the shin
bone). The meniscus acts as a smooth surface ...
Lateral ventricle: One cavity in a system of four communicating cavities within the brain that are continuous with the central canal of the spinal cord.
The four ventricles consist of two lateral ventricles, the third ventricle and the fourth ventricle:
Lateral ventricles: The lateral ventricles a...
Lateral X-ray: An X-ray picture taken from the
Latham bowl: A blood-processing instrument that uses centrifugal force to separate blood into its components: red blood cells, white blood cells, plasma and platelets. Developed by Allen (Jack) Latham Jr. who had grown up on a farm, so the design "was like a milk separator." The Latham bowl revoluti...
Lattice dystrophy: A form of hereditary corneal dystrophy in which there is an accumulation of amyloid deposits, or abnormal protein fibers, throughout the middle and anterior stroma of the cornea. These deposits in the stroma appear on an eye examination as clear, comma-shaped overlapping dots and ...
Laughing gas: Nitrous oxide, a gas that can cause general anesthesia. Nitrous oxide is sometimes given in the company of other anesthetic agents but it is never used today as the only anesthetic agent because the concentration of nitrous oxide needed to produce anesthesia is close to the concentrati...
Launois-Bensaude syndrome: A disorder characterized by painless symmetrical diffuse deposits of fat beneath the skin of the neck, upper trunk, arms and legs.
The condition is thought to be genetic although its exact mode of inheritance is uncertain; it may be a mitochondrial DNA disease. It frequen...
Lauterbur: See: Lauterbur, Paul C....