# coccyx

> English word · Noun · IPA /ˈkɑksɪks/ · frequency rank #79,390

## Definitions
1. The final (bottom-most) fused vertebrae at the base of the spine, the tailbone.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/coccyx