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.
- coc·cyg·e·al [kok-sij-ee-uhl, -sij-uhl], /kɒkˈsɪdʒ i əl, -ˈsɪdʒ əl/, adjective
- in·ter·coc·cyg·e·al, adjective
- pre·coc·cyg·e·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use coccyx in a sentence
The number and size of the coccygeal vertebr vary, apparently in correlation with the increased size of the tail.The Variation of Animals and Plants Under Domestication, Vol. I. | Charles Darwin
The lowest coccygeal vertebrae of man remain as a rudimentary tail.
They are: the ischio-coccygeal, superior sacro-coccygeal, lateral sacro-coccygeal, and inferior sacro-coccygeal.
In the pig, and especially in the horse, it passes further upwards, to arise from the aponeurosis of the coccygeal muscles.
In the pig, it also takes origin higher up from the sacro-sciatic ligament and the coccygeal aponeurosis.
British Dictionary definitions for coccyx
a small triangular bone at the end of the spinal column in man and some apes, representing a vestigial tail
- coccygeal (kɒkˈsɪdʒɪəl), adjective
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
Scientific definitions for coccyx
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.