herniated disk

noun Pathology.
an abnormal protrusion of a spinal disk between vertebrae, most often in the lumbar region of the spine, causing pain due to pressure on spinal nerves.
Also called ruptured disk, slipped disk.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

herniated disk n.
The protrusion of a degenerated or fragmented intervertebral disk into the intervertebral foramen, compressing the nerve root. Also called protruded disk, ruptured disk.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

herniated disk

displacement of part of the rubbery centre, or nucleus, of a cartilaginous disk from between the vertebrae so that it presses against the spinal cord. Pain occurs in the arms if the protrusion occurs at the level of the neck (between the fifth and sixth or sixth and seventh cervical vertebrae) or in the lower back and legs if the protrusion occurs low in the backbone (usually between the fourth and fifth lumbar vertebrae or between the fifth lumbar and first sacral vertebrae). Treatment, depending on the severity of the condition, may include bed rest, analgesic medication (e.g., aspirin), traction, orthopedic support, and physical therapy or surgical removal of the protruded portion of the disk and fusion of the spinal vertebrae at the point affected.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
He once had a herniated disk that kept him off the courts for six months, and he still gets occasional backaches.
There is also some debate about how pain develops from a herniated disk and how frequently it causes low back pain.
He has a herniated disk, not a bulging disk, as the team initially announced.
However, he ended the night in the hospital suffering a herniated disk in his lower back.
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