Dictionary of Medical Terms

Gain a better understanding of medical terminology by searching our dictionary of more than 1,300 terms.

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All terms that start with the letter L

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lordosis

Forward curvature of the spine, producing a hollow in the back.
LSD

Lysergic acid diethylamide. A hallucinogenic drug.
lumbago

Pain in the lower back.
lumbar

Having to do with the lower back, the loins.
lungs

The main respiratory organs in the chest where blood is oxygenated.
lupus erythematosus

A usually chronic inflammatory disease that causes abnormalities of blood vessels and connective tissue in various parts of the…
luteinizing hormone

A hormone secreted by the anterior pituitary gland, responsible for stimulating ovulation in the female and testosterone production in the…
Lyme disease

A disease spread by deer ticks characterized at first by a skin rash, headache and fever, and later by arthritis…
lymph

Consists primarily of a clear, yellowish fluid and white blood cells. Found in the lymphatic system.
lymph node

Any of many small, compact structures lying in groups along the course of the lymphatic vessels and producing lymphocytes.
lymphadenitis

Inflammation of the lymph nodes.
lymphangitis

Inflammation of a lymphatic vessel.
lymphatic system

The vessels and structures involved in carrying lymph from the tissues to the blood.
lymphedema

Swelling of tissue because of the buildup of too much lymph fluid.
lymphocyte

A type of leukocyte (white blood cell) involved in the production of antibodies and the development of immunity.
lymphoma

A malignant tumor of the lymphoid tissues.