from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small triangular bone at the base of the spinal column in humans and tailless apes, consisting of several fused rudimentary vertebrae. Also called tailbone.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The final fused vertebrae at the base of the spine.
from the GNU version of the Collaborative International Dictionary of English
- n. The end of the vertebral column beyond the sacrum in man and tailless monkeys. It is composed of several vertebræ more or less consolidated.
from The Century Dictionary and Cyclopedia
- n. In human anatomy, the part of the spinal column consisting of the last four bones, the caudal vertebræ or tail-bones, which are stunted and usually ankylosed together. See cut under skeleton.
- n. In comparative anatomy and zoology, the caudal vertebræ, when few and small, or ankylosed together; the bony tail itself, when short, as in a bird.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the end of the vertebral column in humans and tailless apes
New Latin, from Greek kokkūx, cuckoo, coccyx (from its resemblance to a cuckoo's beak).(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek κόκκυξ (kokkyx, "cuckoo"), referring to the curved shape of a cuckoo's beak when viewed from the side. (Wiktionary)