The Collaborative International Dictionary
Coccyges
Coccyx \Coc"cyx\, n.; pl. L. Coccyges. [L., cuckoo, Gr. ?, cuckoo, coccyx. So called from its resemblance to the beak of a cuckoo.] (Anat.) The end of the vertebral column beyond the sacrum in man and tailless monkeys. It is composed of several vertebr[ae] more or less consolidated.
Wiktionary
coccyges
n. (plural of coccyx English)
WordNet
coccyges
See coccyx