Dictionary

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

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

laceration See cut.

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.

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.

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

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…

labium The singular form of labia.

labile diabetes See diabetes, labile.

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

labial sound A sound requiring the participation of one or both lips. Also known simply as labial. All labials are consonants. Bilabial sounds, such as “p,” involve both lips, whereas labiodental sounds, such as “v,” involve the upper teeth and lower lip.

labial Pertaining to a lip.