coccyx

Etymology

Latin coccyx, from Ancient Greek κόκκυξ (kókkux, “cuckoo”), referring to the curved shape of a cuckoo's beak when viewed from the side.

noun

  1. (medicine, formal) The final (bottom-most) fused vertebrae at the base of the spine, the tailbone.
    He lands on the concrete path and bounces on his coccyx, which cracks the base of his spine. 2018, Richard Powers, The Overstory, Vintage (2019), page 129

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