Spine/spaɪn/ Definition 1 of 4Pro Tip 1/3Human Structure Refers to the series of bones from skull to tailbone supporting the body. Medical students study the human spine extensively. Pro Tip 2/3Spinal Importance Used to stress critical support like the spine does for the body. A reliable goalkeeper is the spine of a great soccer team. Pro Tip 3/3Medical Context Often used in health and injury discussions. The gymnast is recovering from a spine surgery.