coccyx به انگلیسی
From Longman Dictionary
coc‧cyx /ˈkɒksɪks $ ˈkɑːk-/ noun (plural coccyxes or coccyges /kɒkˈsaɪdʒiːz $ ˈkɑːksə-/) [countable]
the small bone at the bottom of your spine
Example
Too 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