of, pertaining to, or belonging to a spine or thornlike structure, especially to the backbone.
Medicine/Medical. a spinal anesthetic.

1570–80; < Late Latin spīnālis, equivalent to Latin spīn(a) spina + -ālis -al1

spinally, adverb
interspinal, adjective
nonspinal, adjective
prespinal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spinal (ˈspaɪnəl)
1.  of or relating to the spine or the spinal cord
2.  denoting a laboratory animal in which the spinal cord has been severed: a spinal rat
3.  short for spinal anaesthesia

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

spinal spi·nal (spī'nəl)

  1. Relating to or situated near the spinal column or spinal cord.

  2. Relating to any spine or spinous process.

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
Not so long ago, a spinal cord injury meant life in a wheelchair with little
  chance for improvement.
Other studies have also shown that stem cells can heal spinal damage.
The goal is to help those who have lost muscle movement because of spinal cord
Most of her tiny ribs were positioned, as in life, along a sinuous spinal
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