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coc·cyx  (kŏksĭks)
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Tweet n. pl. coc·cy·ges (kŏk-sījēz, kŏksĭ-jēz′) or coccyxes A small triangular bone at the base of the spinal column in humans and other apes, consisting of several fused rudimentary vertebrae. Also called tailbone. [New Latin coccȳx, from Greek kokkūx, cuckoo, coccyx (from its resemblance to a cuckoo's beak).]  (click for a larger image) coccyx |
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