English version

coccyx

From Longman Dictionary of Contemporary English
Related topics: Human
coccyxcoc‧cyx /ˈkɒksɪks $ ˈkɑːk-/ noun (plural coccyxes or coccyges /kɒkˈsaɪdʒiːz $ ˈkɑːksə-/) [countable] technical  HBHthe small bone at the bottom of your spine syn tailbone
Examples from the Corpus
coccyxToo much to expect a new pair of arms to grow out of her ribs, or her coccyx to elongate so enormously.Pain like this after a fall on the coccyx.
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