coccyx

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

• (General American) IPA^(key): /ˈkɑksɪks/
• (Received Pronunciation) IPA^(key): /ˈkɒksɪks/

• Audio (US)

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coccyx (plural coccyges)

1. (medicine, formal) The final (bottom-most) fused vertebrae at the base of the spine, the tailbone.
   • 2018, Richard Powers, The Overstory, Vintage (2019), page 129:

     He lands on the concrete path and bounces on his coccyx, which cracks the base of his spine.

• tailbone (informal)

• bone

• coccygeal
• coccygectomy
• sacrococcyx

• coccyx on Wikipedia.Wikipedia
• coccyx on Wikimedia Commons.Wikimedia Commons

Borrowed from Ancient Greek κόκκυξ (kókkux).

• IPA^(key): /kɔk.sis/

• Audio

  (file)

coccyx m (plural coccyx)

1. (anatomy) coccyx, tailbone

• “coccyx”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

Borrowed from Ancient Greek κόκκῡξ (kókkūx).

• (Classical) IPA^(key): /ˈkok.kyːks/, [ˈkɔkːyːks̠]
• (Ecclesiastical) IPA^(key): /ˈkot.t͡ʃiks/, [ˈkɔtː͡ʃiks]

coccȳx m (genitive coccȳgis); third declension

1. (anatomy) coccyx

Third-declension noun.

• “coccyx”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• coccyx in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette

coccyx m (invariable)

1. Obsolete spelling of cóccix (used in Portugal until September 1911 and in Brazil until the 1940s).