coccygean
/ˌkɒksɪˈɡiːən/Definitions
1. adjective
relating to or situated near the coccyx (the lowest bone in the spine, at the end of the vertebral column).
“The coccygean area of the spine was causing her chronic pain.”
2. noun
the coccyx or the tailbone.
“The doctor examined the coccygean and determined it needed surgery.”