Spi″nous (?), a. 1. Spinose; thorny.
2. Having the form of a spine or thorn; spinelike.
Spinous process of a vertebra(Anat.), the dorsal process of the neural arch of a vertebra; a neurapophysis.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.