Crossword Genius

Bone at the base of the spine (6)

Ross

I believe the answer is:

coccyx

(Other definitions for coccyx that I've seen before include "Tailbone" , "Terminal bone of the vertebral column" , "Bone at the bottom of the spine" , "fused vertebrae" , "Human tail?" .)

I've seen this clue in The New York Times and the Sydney Morning Herald.
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