spine

/ˈspaɪn/

• Noun
• the row of connected bones down the middle of the back
1. This X-ray shows her spine.
• a sharp, pointed part on an animal or plant
1. Hedgehogs are covered with spines.
2. cactus spines
• courage or strength of character
1. They lack the spine to do what needs to be done.

• the part of a book to which the pages are attached
1. Stack the books so that all the spines are facing the same way.