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coccyx

[kok-siks]
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noun, plural coc·cy·ges [kok-sahy-jeez, kok-si-jeez] /kɒkˈsaɪ dʒiz, ˈkɒk sɪˌdʒiz/.
  1. a small triangular bone forming the lower extremity of the spinal column in humans, consisting of four ankylosed rudimentary vertebrae.
  2. 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
Related formscoc·cyg·e·al [kok-sij-ee-uh l, -sij-uh l] /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. 2018

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British Dictionary definitions for coccyx

coccyx

noun plural coccyges (kɒkˈsaɪdʒiːz)
  1. a small triangular bone at the end of the spinal column in man and some apes, representing a vestigial tail
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Derived Formscoccygeal (kɒkˈsɪdʒɪəl), adjective

Word Origin

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

Word Origin and History for coccyx

n.

1610s, from Latin coccyx, from Greek kokkyx "cuckoo" (from kokku, like the bird's English name echoic of its cry), so called by ancient Greek physician Galen because the bone in humans supposedly resembles a cuckoo's beak.

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Online Etymology Dictionary, © 2010 Douglas Harper

coccyx in Medicine

coccyx

(kŏksĭks)
n. pl. coc•cy•ges (kŏk-sījēz, kŏksĭ-jēz′)
  1. 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
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

coccyx in Science

coccyx

[kŏksĭks]
Plural coccyges (kŏk-sījēz, kŏksĭ-jēz′)
  1. A small triangular bone at the base of the spine in humans and apes. It is composed of several fused vertebrae. Also called tailbone
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.