definition of
spine

[1] #1 spine n. [spinal column, vertebral column, backbone, back, rachis] the series of vertebrae forming the axis of the skeleton and protecting the spinal cord; "the fall broke his back". wn

[2] #2 spine n. [spur, acantha] any sharply pointed projection. wn

[3] #3 spine n. [thorn, prickle, pricker, sticker, spikelet] a small sharp-pointed tip resembling a spike on a stem or leaf. wn

[4] #4 spine n. [backbone] 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; "the title and author were printed on the spine of the book". wn

[5] #5 spine n. a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin. wn