Main entry: spine
Definition: a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin
Definition: the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved
Usage: the title and author were printed on the spine of the book
Main entry: back, backbone, vertebral column, spinal column, spine, rachis
Definition: the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
Usage: the fall broke his back
Main entry: spikelet, spine, pricker, prickle, thorn, sticker
Definition: a small sharp-pointed tip resembling a spike on a stem or leaf
Main entry: spine, spur, acantha
Definition: any sharply pointed projection