The series of vertebrae extending from the skull to the pelvis, forming the main support of the body.

“She sat up straight to take the pressure off her spine.”

The part of a book's cover that encloses the inner edges of the pages, visible when the book is on a shelf.

“The gold lettering on the book's spine had faded over time.”

A stiff, sharp-pointed outgrowth on a plant or animal.

“The hedgehog rolled into a ball, showing its sharp spines.”