(hur″ne-a´shәn) abnormal protrusion of an organ or other body structure through a defect or natural opening in a covering membrane, muscle, or bone. See also hernia. Found on http://www.encyclo.co.uk/local/21001
Herniation: Abnormal protrusion of tissue through an opening. For example, a intervertebral disk (one situated between the vertebral bodies) can protrude and impinge on a nerve root. Found on http://www.medterms.com/script/main/art.asp?articlekey=3728
herniation 1. The abnormal protrusion of an organ or other body structure through a defect or natural opening in a covering, membrane, muscle, or bone. 2. The formation of a hernia; a rupture. Found on http://www.wordinfo.info/words/index/info/view_unit/979/