covered with or having spines; thorny, as a plant.
armed with or bearing sharp-pointed processes, as an animal.

1630–40; < Latin spīnōsus; see spine, -ous

spinousness, noun
interspinous, adjective
multispinous, adjective
postspinous, adjective
subspinous, adjective
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World English Dictionary
spinous (ˈspaɪnəs)
1.  resembling a spine or thorn: the spinous process of a bone
2.  having spines or spiny projections
3.  another word for spinose

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

spinous spi·nous (spī'nəs)
Relating to, shaped like, or having a spine or spines.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The spinous process is developed from the junction of the two halves of the vertebral arch.
The spinous process is short and bifid, the two divisions being often of unequal size.
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