the spinal or vertebral column; backbone.
any backbonelike part.
a stiff, pointed process or appendage on an animal, as a quill of a porcupine, or a sharp, bony ray in the fin of a fish.
something, as a quality or trait, that constitutes a principal strength; resolution; stamina; backbone: a situation that would test a person's spine.
a ridge, as of ground or rock.
a sharp-pointed, hard or woody outgrowth on a plant; thorn.
Bookbinding. the back of a book cover or binding, usually indicating the title and author.

1400–50; late Middle English < Latin spīna thorn, backbone

spined, adjective
spinelike, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spine (spaɪn)
1.  the spinal column
2.  the sharply pointed tip or outgrowth of a leaf, stem, etc
3.  zoology a hard pointed process or structure, such as the ray of a fin, the quill of a porcupine, or the ridge on a bone
4.  the back of a book, record sleeve, etc
5.  a ridge, esp of a hill
6.  strength of endurance, will, etc
7.  anything resembling the spinal column in function or importance; main support or feature
[C14: from Old French espine spine, from Latin spīna thorn, backbone]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1400, "backbone," later "thornlike part" (1430), from O.Fr. espine (Fr. épine), from L. spina "backbone," originally "thorn, prickle," from PIE *spei- "sharp point" (cf. L. spica "ear of corn," O.N. spikr "nail;" see spike (n.1)). Meaning "the back of a book" is first
attested 1922. Spineless in fig. sense of "irresolute" is from 1885. Spine-chiller "mystery film" is attested from 1940; spine tingler in same sense is from 1942.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

spine (spīn)

  1. See spinal column.

  2. Any of various short pointed projections, processes, or appendages of bone.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
spine   (spīn)  Pronunciation Key 
  1. See vertebral column.

  2. Any of various pointed projections, processes, or appendages of animals.

  3. A sharp-pointed projection on a plant, especially a hard, narrow modified leaf, as on a cactus, that is adapted to reduce water loss. Compare thorn. See more at leaf.

spinal adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for spined
Other beetles have fossorial legs that are widened and often spined for digging.
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