Dictionary

labile Unstable. For example, labile blood pressure is blood pressure that abnormally increases and decreases frequently.

labile diabetes See diabetes, labile.

labium The singular form of labia.

labor Childbirth, the process of delivering a baby and the placenta, membranes, and umbilical cord from the uterus to the vagina to the outside world. During the first stage of labor (which is called dilation), the cervix dilates fully to a diameter of about 10 cm (2 inches). The first stage of labor is divided…

laboratory A place for doing tests and research procedures, and for preparing chemicals and some medications. Also known as lab.

labyrinth The maze of canals in the inner ear. The delicate membranous canals of the labyrinth are enclosed and protected by a bony chamber that is referred to as the bony labyrinth. The labyrinth is the portion of the ear that is responsible for sensing balance.

labyrinthitis Inflammation of the labyrinth of the ear, which can be accompanied by vertigo. Labyrinthitis has many potential causes including virus infection, Ménière’s disease, and autoimmune disease.

laceration See cut.

lacrimal Pertaining to tears. For example, the lacrimal gland is a gland that secretes tears.

lacrimal gland A small almond-shaped structure that produces tears and is located just above the upper, outer corner of the eye.

lacrimation Shedding tears, or shedding more tears than is normal (for example, as a result of eye injury or irritation).

lactase The enzyme that breaks down the milk sugar lactose. Lactase is essential to digest lactose. Without enough lactase, a person is lactose intolerant. See also lactose intolerance.