coccyx.
The final (bottom-most) fused vertebrae at the base of the spine, the tailbone.
Meaning & usage
The final (bottom-most) fused vertebrae at the base of the spine, the tailbone.
Where this word comes from
Etymology tree Proto-Hellenic *kókkūks Ancient Greek κόκκῡξ (kókkūx)bor. Latin coccyxbor. English coccyx Borrowed from Latin coccyx, borrowed from Ancient Greek κόκκῡξ (kókkūx), referring to the curved shape of a cuckoo's beak when viewed from the side.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.