Meaning of 'spine'

noun

a sharp rigid animal process or appendage

noun

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

Example: "the title and author were printed on the spine of the book"

Synonyms: backbone

noun

the series of vertebrae forming the axis of the skeleton and protecting the spinal cord

Synonyms: back

noun

a small sharp-pointed tip resembling a spike on a stem or leaf

Synonyms: pricker sticker thorn prickle spikelet

noun

any sharply pointed projection

Synonyms: spur acantha