Etymology
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coccyx (n.)

"part of the human spinal column consisting of the last four bones," 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 stunted, coalesced tail-bones in humans supposedly resemble a cuckoo's moderately curved beak. Related: Coccygeal.

updated on January 06, 2018

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Definitions of coccyx from WordNet

coccyx (n.)
the end of the vertebral column in humans and tailless apes;
Synonyms: tail bone
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.