Relating to or located in the coccyx, which is the small triangular bone at the base of the spine.
From Greek 'kokkyx' meaning cuckoo bird (because the bone resembles a cuckoo's beak) plus the suffix '-ean' meaning relating to or belonging to. The anatomical term evolved from this fanciful comparison by ancient physicians.
The coccyx got its funny name because ancient Greeks thought it looked like a cuckoo bird's beak! This proves that even scientists use creative metaphors—and some anatomical names from centuries ago have stuck around because they're just too memorable to change.
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