The plural of coccyx, referring to multiple tailbones.
From Greek 'kokkyx' (cuckoo bird/tailbone) plus the English plural ending '-es'. This is the English-style plural commonly used in modern medical writing.
English speakers often prefer 'coccyxes' (like 'boxes' or 'foxes'), but Greek medical terms show up as 'coccyges,' which shows how languages borrow words but then make them follow their own plural rules!
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