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The first two senses I can find references to throughout google books, however, I can only find references to the spine definition in dictionary style books, so nothing first hand. Speednat (talk) 18:53, 29 January 2013 (UTC)
- I can't verify the "spinal column" portion of the definition based on the three human anatomy cites that I found. But I didn't look a Scholar. DCDuring TALK 22:52, 29 January 2013 (UTC)