[ kok-siks ]
/ ˈkɒk sɪks /
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noun, plural coc·cy·ges [kok-sahy-jeez, kok-si-jeez]. /kɒkˈsaɪ dʒiz, ˈkɒk sɪˌdʒiz/.

a small triangular bone forming the lower extremity of the spinal column in humans, consisting of four ankylosed rudimentary vertebrae.
a corresponding part in certain animals.



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Origin of coccyx

1605–15; <New Latin <Greek kókkyx cuckoo, from its resemblance to a cuckoo's beak


coc·cyg·e·al [kok-sij-ee-uhl, -sij-uhl], /kɒkˈsɪdʒ i əl, -ˈsɪdʒ əl/, adjectivein·ter·coc·cyg·e·al, adjectivepre·coc·cyg·e·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for coccyx

British Dictionary definitions for coccyx

/ (ˈkɒksɪks) /

noun plural coccyges (kɒkˈsaɪdʒiːz)

a small triangular bone at the end of the spinal column in man and some apes, representing a vestigial tail

Derived forms of coccyx

coccygeal (kɒkˈsɪdʒɪəl), adjective

Word Origin for coccyx

C17: from New Latin, from Greek kokkux cuckoo, of imitative origin; from the likeness of the bone to a cuckoo's beak
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for coccyx

[ kŏksĭks ]

n. pl. coc•cy•ges (kŏk-sījēz, kŏksĭ-jēz′)

The small triangular bone located at the base of the spinal column, formed by the fusion of four rudimentary vertebrae, and articulating above with the sacrum.tailbone
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for coccyx

[ kŏksĭks ]

Plural coccyges (kŏk-sījēz, kŏksĭ-jēz′)

A small triangular bone at the base of the spine in humans and apes. It is composed of several fused vertebrae. Also called tailbone
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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