L1-L5 (lumbar vertebrae)
The symbols L1 through L5 represent the five lumbar vertebrae. The lumbar vertebrae are situated between the thoracic vertebrae and the sacral vertebrae in the spinal column.
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Abbreviation for levorotatory, applied to a chemical compound, as in l-dopa. Levorotary is opposed to dextrorotary which is abbreviated as d-. From the Latin laevus, on the left-hand side.
- L
Abbreviation for liter, a metric measure of capacity that, by definition, is equal to the volume of a kilogram of water at 4 degrees centigrade and at standard atmospheric pressure of 760 millimeters of mercury. Metric equivalents — There are 1000 cubic centimeters or 1 cubic decimeter in 1 liter. U.S. equivalent — A liter […]
- LDL cholesterol
Low-density lipoprotein cholesterol, commonly referred to as ‘bad’ cholesterol. Elevated LDL levels are associated with an increased risk of heart disease. Lipoproteins, which are combinations of fats (lipids) and proteins, are the form in which lipids are transported in the blood. Low-density lipoproteins transport cholesterol from the liver to the tissues of the body.
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An acute or chronic poisoning caused by the absorption of lead or any of its salts into the body. Lead poisoning is an environmental hazard that is capable of causing mental retardation, behavioral disturbance, and brain damage. Lead poisoning is formally defined in the US as at least 10 micrograms of lead per deciliter of […]
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Paint or other surface coatings that, by definition, contain lead in excess of 1.0 milligrams per square centimeter (mg/cm2) 0.5 percent by weight. See also lead poisoning.