Etymology
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spine (n.)

c. 1400, "backbone," later "thornlike part" (early 15c.), from Old French espine "thorn, prickle; backbone, spine" (12c., Modern French épine), from Latin spina "backbone," originally "thorn, prickle" (figuratively, in plural, "difficulties, perplexities"), from PIE *spe-ina-, from root *spei- "sharp point" (see spike (n.1)). Meaning "the back of a book" is first attested 1922.

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Definitions of spine

spine (n.)
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord;
Synonyms: spinal column / vertebral column / backbone / back / rachis
spine (n.)
any sharply pointed projection;
Synonyms: spur / acantha
spine (n.)
a small sharp-pointed tip resembling a spike on a stem or leaf;
Synonyms: thorn / prickle / pricker / sticker / spikelet
spine (n.)
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
Synonyms: backbone
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;
From wordnet.princeton.edu